Question

Solve X^2 - 4 =5 by graphing the related function.

Answer 1

Given the following equation:

`\text{ x}^2\text{ -4 = 5}`

Let's determine the solution,

`\text{ x}^2\text{ -4 = 5}`
`\text{ x}^2\text{ - 4 + 4 = 5 + 4}`
`\text{ x}^2\text{ = 9}`
`\text{ }\sqrt{\text{x}^2}\text{ = }\sqrt{\text{9}}`
`\text{ x = }\pm\text{ 3}`

Therefore, there are two possible solutions in the equation. x = 3 or -3.

The answer is Choice A : ± 3