Multiply.
-(3x + 1.2)(3x - 1.2)
A) $9 x ^ { 2 } - 14.4$
B) $9 x ^ { 2 } - 1.44$
C) $9 x ^ { 2 } - 7.2 x - 1.44$
D) $9 x ^ { 2 } - 2.4$

Question

Multiply.
-(3x + 1.2)(3x - 1.2)
A) $9 x ^ { 2 } - 14.4$
B)  $9 x ^ { 2 } - 1.44$
C) $9 x ^ { 2 } - 7.2 x - 1.44$
D) $9 x ^ { 2 } - 2.4$

Quizplus · Accepted Answer

This is a multiplication of two binomials that can be solved using the FOIL method (First, Outer, Inner, Last). The first terms $3x \times 3x = 9x^2$, the outer and inner terms cancel each other out because $3x \times -1.2 + 1.2 \times 3x = 0$, and the last terms $1.2 \times -1.2 = -1.44$. Therefore, the correct answer is $9x^2 - 1.44$.

Multiply -(3x + 1 9x2−14.49 x ^ { 2 } - 14.49x2−14.4

Multiply
-(3x + 1 $9 x ^ { 2 } - 14.4$