Question

How to factorise 9x^2-(x^2-4)^2 by using the formula a^2 - b^2=(a+b)(a-b)

Answer 1

Answer:

Step-by-step explanation:

Whereas a2−b2=(a+b)(a−b) is very simple, to factor a2+b2 requires the use of complex numbers.

(a+ib)(a−ib)

So a2+b2=(a+ib)(a−ib) , but there is no other factoring with real number coefficients.

Answer 2

Answer:

(3x -4+x^2-4) (3x-4-x^2+4)

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