Answer
$9x^{2}a^{2}-24xab+16b^{2}$
Work Step by Step
$(-3xa+4b)^{2}$
$(-3xa+4b)(-3xa+4b)$
Distribute using the FOIL Method
$(-3xa)(-3xa)+(-3xa)(4b)+(4b)(-3xa)+(4b)(4b)$
Simplify
$9x^{2}a^{2}-12xab-12xab+16b^{2}$
Simplify
$9x^{2}a^{2}-24xab+16b^{2}$
