ashtank33 ashtank33

15-06-2020
Mathematics

contestada

Solve x2+4x-7=0 by completing the square

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mhanifa mhanifa

15-06-2020

Answer:

-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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Ogulab21 Ogulab21

15-06-2020

(X+2)^2 - 2 - 7
(X+2+3) (x+2-3)

Answer Link

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