Question

Which are solutions of the equation x^2- 16 = 0? Check all that apply

O
x = -8
X=-4
X=-2
X=2
X=4
X=8

Answer 1

x= -4

x= 4

Explanation:

This is a quadratic equation, and can be solved very quickly since it only has two terms, the square one and the free term.

Hence the solutions is obtained following the steps from below:

x2-16=0

Lets sum to both side 16

x2-16=0+16

x2=16

Now, lets apply square root to whole equation:

`\sqrt{x^(2) }=√(16)`

`x=|4|`

The bars means that x can be-4 o 4, since -4^2=16 and 4^2=16