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anonymous
 5 years ago
solve the equation by completing the square a^2+2a35=0
anonymous
 5 years ago
solve the equation by completing the square a^2+2a35=0

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anonymous
 5 years ago
Best ResponseYou've already chosen the best response.0a^2+2a35=0 (a+7)(a5)=0 (By factorization) take (=0) for both sides, a=7 or a=5

amistre64
 5 years ago
Best ResponseYou've already chosen the best response.0Completing the square: a^2 +2a 35=0  add (35); a^2 +2a +K = 35 +K  K = (b/2)^2 where b=2 a^2 +2a +1 = 35+1  factor the LHS into a perfect square; add RHS together (a+1)^2 = 36  take the square root of both sides a+1 = 6 or a+1 = 6 solve for "a" a= 5 or a=(7)  check your answers to eliminate false hope :) (5)^2 +2(5) 35 = 0 25 +10 35 = 0 35  35 = 0 (a=5, is good) (7)^2 +2(7) 35 = 0 49  14  35 = 0 49  49 = 0 (a=(7), is good) a= 7 and a=5

amistre64
 5 years ago
Best ResponseYou've already chosen the best response.0On a test, I would just factor like razmik did to get the answers; then double check :)
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