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Given x2 + 8x  20 = 0. Which expression below would be a correct step if solving by completing the square?
A. (x + 16)2 = 36
B. (x + 4)2 = 20
C. (x + 4)2 = 36
D. (x + 16)2 = 20
 one year ago
 one year ago
Given x2 + 8x  20 = 0. Which expression below would be a correct step if solving by completing the square? A. (x + 16)2 = 36 B. (x + 4)2 = 20 C. (x + 4)2 = 36 D. (x + 16)2 = 20
 one year ago
 one year ago

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jim_thompson5910Best ResponseYou've already chosen the best response.0
Work your way backwards So say we want to test if choice D is the answer (x + 16)^2 = 20 x^2 + 32x + 256 = 20 x^2 + 32x + 256  20 = 0 x^2 + 32x + 236 = 0 This is NOT the same as x^2 + 8x  20 = 0, so choice D can't be the answer.
 one year ago

kenneyfamilyBest ResponseYou've already chosen the best response.1
its B right? @jim_thompson5910
 one year ago

jim_thompson5910Best ResponseYou've already chosen the best response.0
(x + 4)^2 = 20 x^2 + 8x + 16 = 20 x^2 + 8x + 16  20 = 0 x^2 + 8x  4 = 0 which is NOT the same as x^2 + 8x  20 = 0
 one year ago

kenneyfamilyBest ResponseYou've already chosen the best response.1
ok got it..C thanks!!
 one year ago
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