Question

tìm x:
(x + 4)(x - 4) - x(x + 6) = 8

Answer 1

\(\left(x+4\right)\left(x-4\right)-x\left(x+6\right)=8\)

\(\Leftrightarrow x^2-16-x^2-6x=8\)

\(\Leftrightarrow-6x=24\Leftrightarrow x=-4\)

Answer 2

\(\left(x+4\right)\left(x-4\right)-x\left(x+6\right)=8\)

\(\Leftrightarrow x^2-16-x^2-6x=8\)

\(\Leftrightarrow-6x=24\)

hay x=-4

Answer 3

(x + 4)(x - 4) - x(x + 6) = 8

<=> x² - 16 - x² - 6x = 8

<=> x² - x² - 6x = 8 + 16

<=> -6x = 24

<=> \(x=-4\)