Multiply.
-$\left(x^{2}+0.7\right)\left(x^{2}-0.7\right)$
A) $x^{2}-0.49$
B) $x^{4}-0.49$
C) $x^{4}+0.49$
D) $x^{2}+0.49$

Name: Multiply. -$\left(x^{2}+0.7\right)\left(x^{2}-0.7\right)$ A) $x^{2}-0.49$ B) $x^{4}-0.49$ C) $x^{4}+0.49$ D) $x^{2}+0.49$
Brand: Quizplus
Rating: 4.9 (41 reviews)

Question

Quizplus · Accepted Answer

This is an application of the difference of squares formula, $a^2 - b^2 = (a + b)(a - b)$, where $a = x^2$ and $b = 0.7$. So, $(x^2 + 0.7)(x^2 - 0.7) = x^4 - 0.49$.

Multiply - (x2+0.7)(x2−0.7)\left(x^{2}+0.7\right)\left(x^{2}-0.7\right)(x2+0.7)(x2−0.7) A) x2−0.49x^{2}-0.49x2−0.49 B) x4−0.49x^{4}-0.49x4−0.49 C) x4+0.49x^{4}+0.49x4+0.49 D) x2+0.49x^{2}+0.49x2+0.49

Multiply
- $\left(x^{2}+0.7\right)\left(x^{2}-0.7\right)$ A) $x^{2}-0.49$ B) $x^{4}-0.49$ C) $x^{4}+0.49$ D) $x^{2}+0.49$