Question

Please solve using square root method
thanks. :)
y = 9x^2 - 36

Answer 1

`x =` ±
`2`

Explanation:

Step 1: Solve using square root method

I'm not sure if y is supposed to be there or if there needs to be a 0 there. If we was to just find the value of x's then we can do the following.

Leave x by itself

`0 = 9x^2 - 36\\0 + 36 = 9x^2 - 36 + 36\\36 = 9x^2`

Divide both sides by 9

`(36)/(9) = (9x^2)/(9)`

`4 = x^2`

Square root both sides

`√(4) = √(x^2)`

±
`2 = x`

Answer:
`x =` ±
`2`