anajahdollsp3u8om anajahdollsp3u8om

15-09-2019
Mathematics

contestada

Multiply.
(3x + 2)(3x - 2)
A. x² + 12x- 4
B. 9x² – 12x - 4
c. 9x - 4
D. 9x² + 4

Respuesta :

mashnoovc mashnoovc

15-09-2019

Answer: 9x²-4

Step-by-step explanation:

To solve use the formula (known as the difference of squares) a²-b²=(a+b)(a-b) and substitute a with 3x and b with 2 and then substitute to find: (3x)²-2²= 9x²-4

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