Question

Use a suitable identity to get each of the following products:
$(6x-7)(6x+7)$

Answer 1

$(6x-7)(6x+7)$
$=(6x{)}^2-(7{)}^2\left[Usingtheidentity\right(a-b\left)\right(a+b)=a^2-b^2$]
$=36x^2-49$