Question

PLS HELP!!!

Solve x^2 – 4 = 5 by graphing the related function.

A) There are two solutions: 3 and –3.


B) There are two solutions: ±1.


C) There is one solution: 1


D) There are no real number solutions.

Answer 1

A) There are two solutions: 3 and -3
Plug in 3 into X, so it will be 3^2=9
9-4= 5, that makes 3 a solution.
Plug in -3 into X, so it will be -3^2=9
9-4=5, that makes -3 a solution.

Answer 2

A

Explanation:

Because we can rearrange the equation and get:

x²=5+4

x²=9

`x = √(9)`

`x = + 3 \: \: or \: \: - 3`