Question

Solve y = x2 +7 for x.

Answer 1

$\huge\boxed{x=\sqrt{y-7}}$

We are trying to isolate $x$. Subtract $7$ from both sides. $y-7=x^2$

Find the square root of both sides. $\boxed{\sqrt{y-7}}=x$

Note: I've attached a graph of $y=x^2 +7$.