Question

multiply. (d - 8)(d + 8) simplify your answer.

Explanation:

Step1: Apply difference - of - squares formula

We know that $(a - b)(a + b)=a^{2}-b^{2}$. Here $a = d$ and $b = 8$.
$(d - 8)(d + 8)=d^{2}-8^{2}$

Step2: Calculate $8^{2}$

$8^{2}=64$, so $d^{2}-8^{2}=d^{2}-64$

Answer:

$d^{2}-64$