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Melanie Richardson
Mathematics
23 February, 16:25
Solve x2+4x-7=0 by completing the square
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Rodolfo Gilbert
23 February, 16:38
0
-2 - √11
-2+√11
Step-by-step explanation:
x²+4x-7=0 x²+4x+4 - 11=0 (x+2) ²-11=0 (x+2+√11) (x+2-√11) = 0 x+2+√11=0 ⇒ x = - 2 - √11 x+2 - √11=0 ⇒ x = - 2+√11
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Bubbles
23 February, 16:48
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(X+2) ^2 - 2 - 7
(X+2+3) (x+2-3)
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