Evaluate Using the Given Value y^2-x ; use x=7 ; and y=7

$y^{2} - x$ ; use $x = 7$ ; and $y = 7$

Replace the variable $x$ with $7$ in the expression.

$y^{2} - (7)$

Replace the variable $y$ with $7$ in the expression.

${(7)}^{2} - (7)$

Simplify each term.

Raise $7$ to the power of $2$ .

$49 - (7)$

Multiply $- 1$ by $7$ .

$49 - 7$

Subtract $7$ from $49$ .

$42$