# Lesson40 - hours. What is the speed for each part of the...

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Lesson 40 Section 8.2 Quadratic Formula: If 0 2 = + + c bx ax , then the value(s) of x can be found by a ac b b x 2 4 2 - ± - = . Note: b - mean the opposite of b 2 b is always positive ac 4 - means ( - 4)( a )( c ) Use the quadratic formula to solve the following quadratic equations. 1) x x - = - 2 2 2) 0 7 15 2 2 = - - t t 3) ) 2 ( 3 4 - = x x 4) ) 2 ( 4 7 ) 1 ( 5 - = - - x x x x 1

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5) If 4 12 9 ) ( 2 - - = a a a f , find any a such that 0 ) ( = a f . 6) 10 ) 3 ( 2 8 = - + x x x 7) ) 2 ( 2 3 + = r r 8) x x 12 ) 1 ( 3 2 - = + 2
9) 2 2 If ( ) , find all for which ( ) 1 3 g x x g x x x = + = + 10) A boat travels 24 miles at a certain speed, and then continues for 30 miles farther at a speed that is 3 miles per hour faster. The total time of the entire trip is 4

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Unformatted text preview: hours. What is the speed for each part of the trip? Distance Rate Time 1 st part 2 nd part time for 1 st part + time for 2 nd part = 4 hours 3 11) Two hoses together can fill a pool in 2 hours. The larger hose alone can fill the pool is 3 hours less time than the smaller hose. How long would it take each hose alone to fill the pool? x = time alone for smaller hose x 3 = time alone for larger hose rates: 4...
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Lesson40 - hours. What is the speed for each part of the...

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