Question

tìm x 

x^2 - 16 = 0 

 

Answer 1

\(\left(x-4\right)\left(x+4\right)=0\Leftrightarrow\left[{}\begin{matrix}x=4\\x=-4\end{matrix}\right.\)

Answer 2

 x^2-16=0
<=> x^2 = 16
<=>x = √16
<=> x = 4 hoặc x = -4

Answer 3

x² - 16 = x² - 4² = (x - 4)(x + 4) = 0
=> x = 4 hoặc x =–4
(x = +–4)