Question

x²-16=0

Answer 1

x²-4²=0

x-4=0

x=0+4

x=4

Answer 2

`x^2-16=0`

`x^2=16`

`@TH1:x^2=4^2`

       `=>x=4`

`@TH2:x^2=(-4)^2`

       `=>x=-4`

Vậy `x=4` hoặc `x=-4`

Answer 3

\(x^2-16=0\\ x^2-4^2=0\\ \left(x+2\right)\left(x-2\right)=0\\ th1:x+2=0\\ x=-2\\ th2:x-2=0\\ x=2\)

Answer 4

x= 4 vì 4 mũ 2 = 16

 

Answer 5

\(x^2-16=0\)

\(x^2\)         \(=0+16=16\)

\(x\)           \(=\sqrt{16}=\pm4\)