Find the dimensions of rectangle ABCD of maximum area.
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1 QURTIS (hapter 1) 47 7 Infinitel man rectangles ma e inscried within the right angled triangle shown alongside. One of them is illustrated. a Let = cm and = cm. Use similar triangles to find in terms of. Find the dimensions of rectangle of maimum area. 6 cm 8 cm 8 The points P 1 (a 1, 1 ), P(a, ), P 3 (a 3, 3 ),..., Mn P n (a n, n ) are eperimental data. The points are approimatel linear through the origin O(0, 0). P3 M4 Pn P1 To find the equation of the line of est fit through the M M3 P4 origin, we decide to minimise (P 1 M 1 ) +(P M ) +(P 3 M 3 ) + :::: +(P n M n ) where M1 P [P i M i ] is the vertical line segment connecting each point P i with the corresponding point M i on the line with the same -coordinate a i. Find the gradient of the line of est fit in terms of a i and i, i =1,, 3, 4,..., n. 9 Write =( a )( a + )( + a )( + a + ) in epanded form and hence determine the least value of. ssume that a and are real constants. 10 considering the function =(a 1 1 ) +(a ), use quadratic theor to prove the auch-schwarz inequalit: ja a j 6 p a1 + a p , c 1,, and c are real numers such that 1 =(c 1 + c ). Show that at least one of the equations c 1 =0, + + c =0 has two real roots. REVIEW SET 1 NON-LULTOR 1 onsider the quadratic function = ( + )( 1). a State the -intercepts. State the equation of the ais of smmetr. c Find the -intercept. d Find the coordinates of the verte. e Sketch the function. Solve the following equations, giving eact answers: a 3 1 = = 0 c 11 =60 3 Solve using the quadratic formula: a +5 +3= =0 4 Solve completing the square : +7 4=0 5 Use the verte, ais of smmetr, and -intercept to graph: a =( ) 4 = 1 ( +4) +6 6 Find, in the form = a + + c, the equation of the quadratic whose graph: a touches the -ais at 4 and passes through (, 1) has verte ( 4, 1) and passes through (1, 11).
2 48 QURTIS (hapter 1) 7 Find the maimum or minimum value of the relation = and the value of at which this occurs. 8 The roots of 3 =4 are and. Find the simplest quadratic equation which has roots 1 and. 1 9 Solve the following equations: a +10=7 + 1 =7 c 7 +3=0 10 Find the points of intersection of = 3 and = For what values of k does the graph of = +5 + k not cut the -ais? 1 Find the values of m for which 3 + m =0 has: a a repeated root two distinct real roots c no real roots. 13 The sum of a numer and its reciprocal is Find the numer. 14 Show that no line with a -intercept of (0, 10) will ever e tangential to the curve with equation = One of the roots of k +(1 3k) +(k 6) = 0 is the negative reciprocal of the other root. Find k and the two roots. REVIEW SET 1 1 onsider the quadratic function = a onvert it to the form = a( h) + k. State the coordinates of the verte. c Find the -intercept. d Sketch the graph of the function. LULTOR Solve: a ( )( +1)=3 4 1 =5 3 raw the graph of = +. 4 onsider the quadratic function = Find the equation of the ais of smmetr, and the coordinates of the verte. 5 Using the discriminant onl, determine the nature of the solutions of: a 5 7= =0 6 a For what values of c do the lines with equations =3 + c intersect the paraola = + 5 in two distinct points? hoose one such value of c from part a and find the points of intersection in this case. 7 Suppose [] has the same length as [], [] is cm shorter than [], and [E] is 7 cm in length. Find the length of []. E
3 QURTIS (hapter 1) m of chicken wire is availale to construct a rectangular chicken enclosure against an eisting wall. a If = m, show that the area of rectangle is given = (30 1 ) m. Find the dimensions of the enclosure which will maimise the area enclosed. m eisting wall 9 onsider the quadratic function = a State the ais of smmetr. Find the coordinates of the verte. c Find the aes intercepts. d Hence sketch the function. 10 n open square-ased container is made cutting 4 cm square pieces out of a piece of tinplate. If the volume of the container is 10 cm 3, find the size of the original piece of tinplate. 11 onsider = 5 +3 and = a Solve for : 5 +3= Hence, or otherwise, determine the values of for which > Find the maimum or minimum value of the following quadratics, and the corresponding value of : a = = m of fencing is used to construct 6 rectangular animal pens as shown. a Show that the area of each pen is ³ = m. 9 c Find the dimensions of each pen so that it has the maimum possile area. What is the area of each pen in this case? m m 14 Two different quadratic functions of the form =9 k +4 each touch the -ais. a Find the two values of k. Find the point of intersection of the two quadratic functions. REVIEW SET 1 1 onsider the quadratic function = 1 ( ) 4. a State the equation of the ais of smmetr. Find the coordinates of the verte. c Find the -intercept. d Sketch the function. Solve the following equations: a 5 3=0 7 3=0
4 50 QURTIS (hapter 1) 3 Solve the following using the quadratic formula: a 7 +3=0 5 +4=0 4 Find the equation of the quadratic function with graph: a c (, -0) =4-3 5 Use the discriminant onl to find the relationship etween the graph and the -ais for: a = +3 7 = etermine whether the following quadratic functions are positive definite, negative definite, or neither: a = +3 + = Find the equation of the quadratic function shown: (, 5) 1 8 Find the -intercept of the line with gradient 3 that is tangential to the paraola = For what values of k would the graph of = + k cut the -ais twice? 10 Find the quadratic function which cuts the -ais at 3 and and which has -intercept 4. Give our answer in the form = a + + c. 11 For what values of m are the lines = m 10 tangents to the paraola =3 +7+? 1 a +(3 a) 4=0 has roots which are real and positive. What values can a have? 13 a etermine the equation of: i the quadratic function ii the straight line. For what values of is the straight line aove the curve? Show that the lines with equations = 5 + k are tangents to the paraola = 3 + c if and onl if c k = =0 has roots p, q. Find all quadratic equations with roots p 3 and q 3.
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