Question

1. $x=8$, $x^{2}-20$

Explanation:

Step1: Substitute x=8 into expression

$x^2 - 20 = 8^2 - 20$

Step2: Calculate 8 squared

$8^2 = 64$

Step3: Subtract 20 from the result

$64 - 20 = 44$

Answer:

44