Multiply.
-$\left( x ^ { 2 } - 3 b \right) \left( x ^ { 2 } + 3 b \right)$
A) $x ^ { 4 } - 6 x ^ { 2 } b + 9 b ^ { 2 }$
B) $x ^ { 4 } + 6 x ^ { 2 } b + 9 b ^ { 2 }$
C) $x ^ { 4 } - 9 b ^ { 2 }$
D) $x ^ { 2 } - 9 b ^ { 2 }$

Question

Quizplus · Accepted Answer

This is a difference of squares problem, where the formula is $a^2 - b^2 = (a - b)(a + b)$. Applying this to the given expression, $a = x^2$ and $b = 3b$, so the result is $x^4 - 9b^2$.

Multiply - (x2−3b)(x2+3b)\left( x ^ { 2 } - 3 b \right) \left( x ^ { 2 } + 3 b \right)(x2−3b)(x2+3b)

Multiply
- $\left( x ^ { 2 } - 3 b \right) \left( x ^ { 2 } + 3 b \right)$