Question

Which is equivalent to (9y squared - 4 x)(9 y squared + 4 x), and what type of special product is it?

Answer 1

Answer:

81$y^{4}$-16$x^{2}$

Step-by-step explanation:

(9$y^{2}$-4x)(9$y^{2}$+4x)

= [ (9$y^{2}$)^2 - (4x)^2]                     { using the formula (a+b)(a-b) = (a)^2 - (b)^2}

=  81$y^{4}$-16$x^{2}$