Exponents and Radical
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- Britney Wilkins
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1 Expoets d Rdil Rule : If the root is eve d iside the rdil is egtive, the the swer is o rel umber, meig tht If is eve d is egtive, the Beuse rel umber multiplied eve times by itself will be lwys positive Exmple 9 ot rel umber Exmple ot rel umber, 8 Rule : for y rel umber, the Therefore the priipl squre root of is the bsolute vlue of the root Exmple x x, Exmple 8x x Rule : If is whole umber tht is ot perfet squre the is irrtiol umber Exmple rtiol umber, Exmple irrtiol umber, 8 No rel umber No rel umber 8 8 No rel umber No rel umber No rel umber No rel umber 0 000, ,000 No rel umber x 8 x x 8x ( y + ) ( y + ) ( y + ) ( y + )
2 Rtiol Expoets Writig rtiol expoets s rdils or vie vers: The umertor beomes the power d the deomitor beomes the root. / ( ) m / m / Exmples m / 8 8 / ( ) / 8 / ( ) 9 9 A review of rules of Expoets / ( ) / 9 ( 9 ) m m+ m m b b m ( ) m ( ) m m m Prties b b As As / / / / / t t / / / 8 / / / / / / / ( ) / ( ) / 8x ( ) / b x b 9 ( ) / b 9 x / 8 8 /9 8 9 x / /0 9 9 x / 0 9 / 0 / b x / 8 x x
3 Rule to Multiply Rdils b b Rule to divide Rdils b b You multiply or divide the isides of rdil s log s they hve the sme roots. 8 b 0b 0 b b + b b b ( ) ( )( ) 8 Simplifyig Rdils You simplify terms iside the rdils, if ll terms re i produt form d their power is divisible by the root. Exmples b 8 bb b b b Prties x x b b b 0x x 0 8x y 80x x y x x x y x y ( x+ y) ( x+ y) xy x 0x xy x y x x 8y y 8 00y y / / 9 0 b y y y /+ / 9/ b b x y x y y x y y b ( ) x+ y x+ y b 9 b b b Addig d subtrtig rdils b You dd or subtrt if they hve the sme roots d rdids. Exmples + 0 x x x 8. 9 C ot be simplified
4 Prties Multiplyig d dividig rdils Exmples ( 8 + ) + + x x ( )( ) ( y y y ) + ( ) ( ) x y y y y Cojugte: Pir of rdil expressios tht the middle sig is differet d their produt will use rdils to be removed. x d + x d x x + x d x + re ojugte ( x )( x + ) x re ojugte ( + )( ) x x re ojugte ( )( ) x x x x + x x x x x x Usig ojugte llows us to rtiolize deomitors tht oti two terms. If there is oly oe term, o eed for ojugte, just multiply umertor d deomitor by deomitor multiply umertor d deomitor by ojugte of deomitor + ( + ) ( + ) ( + ) ( + )( 8+ )
5 Prties 0 + ( ) ( ) Solutio ( ) ( ) ( ) ( ) + Solvig Rdil Equtios ) Isolte oe of the rdils ) Rise both sides to the power of the roots of the rdil ) Simplify d solve ) Chek x x x ( x ) ( ) x + x No solutio beuse squre root of umber is ever egtive. + + ( x+ ) ( x+ ) x x x+ x+ x x x x + x 8 x x+ + x x x ( x ) ( ) x ( x ) ( ) + ( ) ( ) x 0x + x+ x x ( x 9)( x ) 0 x 9 x Prties x x + oly x 9 works Problem x + 8 x + 0 / x / x + 0 x x + x x
6 Pythgore theorem I right trigle, the formul tht desribe the reltioship betwee the hypoteuse d the two legs d b + b or + b Exmple : Fid the two legs of right trigle re d ihes wht is the legth of the hypoteuse? + diste betwee (,), (,), usig the diste formul d ( ) + ( ) 9 + Prtie : Fid the two legs of right trigle re d 8 ihes wht is the legth of the hypoteuse? Prtie : Use the Pythgore theorem to fid the height,( from the bse of the third floor to the groud). I this problem the legth of the ldder will be the hypoteuse. + h 0 h 0 00 h. Diste Formul The formul for the diste betwee two poits ( x, y), ( x, y) is give by Exmple : Fid the diste betwee (,), (,), usig the diste formul d ( ) + ( ) 9 + Prtie: Fid the diste betwee (, ), (8, ) Midpoit Formul d ( x x ) + ( y y ) The formul for the midpoit betwee two poits ( x, y), ( x, y) is give by M x + x y + y, + + Exmple : Fid midpoit betwee (,), (,), usig the diste formul M, (,0) Prtie: Fid the midpoit betwee (, ), (8, ).
7 i or i is lled imgiry umber or. Imgiry umber Exmple : ( ) i, Exmple : 8 8( ) ( ) i Complex umber A omplex umber is umber tht be expressed i the form + bi, where d b re rel umbers d i is the imgiry uit Exmple : + i, Exmple : 0+ i i Exmple : + 0i, Exmple : + i Add or subtrt Complex umbers Exmple : dd + i d i Exmple : dd + i d i + : ( + i) + ( i) + + i + : ( + i) ( i) + + i Multiply Complex umbers Exmple : ( + i)( + i) : ( )( ) ( + i) + i + i + i 8 + i i+ i 8 8i+ ( ) 8i Exmple : ( + i)( i) : ( + i)( i) i ( ) 9 ( i) Divide by Complex umbers If umber is divided by omplex umber, we eed to multiply tht the ojugte of its deomitor. Exmple : i, i i i i i i i Exmple :, + i ( i) ( i) ( i) ( i) i + i i 9i 9( ) + 9 Power of i Exmple : i ( i ) ( ) Exmple : i ( i ) ( ) ( i ) 8 8 Exmple : i i i ( i ) i ( ) i ( ) i i Exmple : ( ) ( ) ( ) + + i i i i i i i i i
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