1. Find the real solutions, if any, of a. x 2 + 3x + 9 = 0 Discriminant: b 2 4ac = = 24 > 0, so 2 real solutions. Use the quadratic formula,
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1 Math 110, Winter 008, Sec, Instructor Whitehead P. 1 of 8 1. Find the real solutions, if any, of a. x + 3x + 9 = 0 Discriminant: b 4ac = = 7 < 0, so NO real solutions b. x 4x = 0 Discriminant: b 4ac = = 4 > 0, so real solutions Use the quadratic formula, b ± b 4ac a = 4 ± 4 = 4 ± 6 = ( 4) ± ( 4) = ± 6 x = + 6, x = 6 or complete the square x 4x = 0 x 6 = 0 x = 6 x = ± 6 x = ± 6 x = + 6, x = 6. Calculate: a. 3i 3 + 4i 3i 3 + 4i = 9i + 1i = 1 9i b. +3i 1 i +3i 1 i = +3i 1 i 1+i = +3i+i+3i = 3+5i = i 1+i 1 i Solve 4 x > 1 + x for x, express the result as an interval, and draw it on a number line. 4 1 > x + x 3 > 3x 1 > x x < 1 x < 1 or (, 1)
2 Math 110, Winter 008, Sec, Instructor Whitehead P. of 8 4. Equations of circles: a. What are the center and radius of a circle with equation x + (y + ) = 9? (x ) +(y k) = r x 0 + (y ( )) = 3 Center is (0, ) Radius is 3 b. Write an equation of the circle with center at (4,) and radius. (x ) +(y k) = r (x 4) +(y ) = (x 4) +(y ) = 4 5. Put f x = x x + into the standard form a(x ) + k. Then sketch the graph of f x and label a. The vertex b. The axis of symmetry c. The y-intercept d. The x-intercepts, if any. Standard form - complete the square: f x = x x f x = x a = 1, = 1, k = 1 Vertex: 1,1 Axis of symmetry: x = 1 Y-intercept: f 0 = (0,) X-intercepts: 0 = f x = (x 1) + 1 x 1 = 1 No solution so no x-intercepts
3 Math 110, Winter 008, Sec, Instructor x = 1 Whitehead P. 3 of 8 y-int (0,) Vertex (1,1) 6. Which of the following define y as a function of x? (OK just to say Yes or No ) a. { 4,4, 3,4, 3,1, 0,0 } b. y = x c. X (state) Y (Senator) Arizona McCain NY Clinton Washington Murray Arizona Kyl a. NO b. YES c. NO 7. Find the domain for each of these functions a. f x = x + x + 0 x b. g x = x x x Avoid dividing by 0: x x 0 x x 1 0 All x 0 or 1
4 Math 110, Winter 008, Sec, Instructor Whitehead P. 4 of 8 c. x = ln (x + 4) Avoid ln 0 or negative x + 4 > 0 All x > 4, or ( 4, ) 8. If f x = x + 1 and g x = x then evaluate a. f 1 f 1 = = = b. g f x g f x = f x = x + 1 c. f g(x) f g x = x + 1 = x The graph of y = f(x) is shown below: a. Is f(x) even, odd, or neither?even b. Is f 1 positive, negative, or zero? Positive c. List any intervals on which f(x) is increasing (,0)and(,3) d. Identify any local minima of f(x) (, 1) and (, 1) e. How often does the line y = intersect the graph? 0 times
5 Math 110, Winter 008, Sec, Instructor Whitehead P. 5 of Transformations of graphs a. What equation is obtained by shifting the graph of f x = ln x to the right by units? Change x by -: f x = ln(x ) b. What function has the same graph as f x = x, shifted down by 1 unit? Change y (outside the function) by -1: f x = x For each of the following, say if it is a polynomial, and if it is, state the degree a. g x = x 4 1 x g x = x4 1 x = x 1 x No b. f x = x + e x No c. x = x(x + 1) Yes, degree 3 1. Analyze f x = x+1 and provide the following information: x a. Domain b. Vertical asymptotes if any c. Horizontal asymptote if any d. All intercepts e. Sketch the graph SOLUTION: General form:f x = x+1 x Factored form: f x = x+1 x Domain:x Lowest terms: f x = x+1 x Vertical asymptotes: x = End behavior: Ratio of leading terms x x = 1 When x, f x 1 When x, f x 1 Horizontal asymptote: y = 1
6 Math 110, Winter 008, Sec, Instructor Whitehead P. 6 of 8 y-intercept: f 0 = 1 = 1 (0, 1 ) x-intercepts: f x = 0 x + 1 = 0 x = 1 ( 1,0) Test points: f 3 = 4 = x 4 = (3,4) 1 (3,4) ( 1,0) y = 1 (0, 1 ) 13. Say whether each of the following is an exponential function of x a. f x = ln (x )NO b. f x = e No c. f x = x 5 No d. f x = 3 x Yes 14. Solve 3 x = 9 x for x 3 x = 9 x = 3 x x = x x = 15. Logarithms a. Write this equation as an equivalent equation involving an exponent: log 10 y = = y b. Find log 16 Let log 16 = x x = 16 4 = 16
7 Math 110, Winter 008, Sec, Instructor Whitehead P. 7 of 8 x = 4 log 16 = Logarithms, continued a. Write this a single logarithm and simplify if possible 3 log (u) log (u ) = log (u 3 ) log (u ) = log ( u3 u ) = log (u) b. Find log 5 (71) with a calculator by using the LN (natural logarithm) key. log 5 (71) = ln 71 ln 5 = You have 100 yards of fencing and will use it to enclose 3 sides of a rectangular lot. The 4 th side is the wall of a large building, so it doesn t need fencing. a. Express the area A of the rectangle as a function of w, the dimension of the rectangle perpendicular to the existing wall. A = lw 100 = w + l Solve for l in terms of w: 100 = w + l l = 100 w A = 100 w w A(w) = w + 100w b. What is the domain of the function? Both l and w must be non-negative: w 0 and l 0. Substitute l = 100 w. Then 100 w 0 w 100 w 50 Putting the information together the domain is 0 w 50 c. What is the area if the width is 0 feet? A 0 = (0 ) = = 1600 sq yds
8 Math 110, Winter 008, Sec, Instructor Whitehead P. 8 of A colony of bacteria grows exponentially. The population is measured to be 000. Then hours later it is 3,000. a. Write an equation for the population as a function of time. b. What will the population be at 4 hours? c. When will the population be 10,000? A(t) = A 0 e kt a. Second sentence means A 0 = 000 Third sentence means A A 0 = 3 = = A = A 0 ek since A = A 0 e k ln 1.5 = ln e k = k ln 1.5 k = = 0.07 A t = A 0 e kt = 000e 0.07t b. At 4 hours, the population will be A 4 = 000e = 4500 c. Solve = A t = 000e 0.07t 5 = e 0.07t ln 5 = 0.07t t = ln 5 = hours 0.07
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