To factor 9x^2-16 you can first rewrite the expression as:
A.(3x^2)-(4)^2
B.(3x-4)^2
C.(3x)^2-(4)
D. None of the above

Question

To factor 9x^2-16 you can first rewrite the expression as:
A.(3x^2)-(4)^2
B.(3x-4)^2
C.(3x)^2-(4)
D. None of the above

usukidoll · Answer

we have perfect square numbers 9 and 16
a perfect square is
the product of a rational number multiplied by itself.
the product of a polynomial multiplied by itself.

We have the formula
$$(a^2-b^2) = (a+b)(a-b) $$

usukidoll · Answer

A perfect square is a number that can be expressed as the product of two equal integers.

anonymous · Answer

(3x+4)(3x−4)

welshfella · Answer

this is called the difference of 2 squares 
and is described by the identity UsukiDoll posted

a^2 - b^2 = (a + b)(a - b)

usukidoll · Answer

I forgot about typing "difference of 2 squares". thank you for pointing that out @welshfella