Question

Factors of
$7p^2+21q^2$

• A. $3(p^2+7q^2)$
• B. $7(p^2-3q^2)$
• C. $7(p^2+3q^2)$
• D. $7(p^2+2q^2)$

Answer 1

The correct option is C

$7(p^2+3q^2)$

$7p^2+21q^2=7\times p\times p+3\times 7\times q\times q=7(p^2+3q^2)$