Question

Q13 Factorize x^4 -81y^4​

Answer 1

Answer:

x⁴-81y⁴

=(x²)²-(9y²)²

=(x²+9y²)(x²-9y²)

=(x²+9y²){(x)²-(3y)²}

=(x²+9y²)(x+3y)(x-3y)