( x^2 – 9 )( x^2 – 9 )
which identity is going to be used?
also solve the question
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(x^2-9)(x^2-9)
formula is (a-b)^2=a^2-2ab+b^2
(x^2-9)(x^2-9)= (x^2)2 -2(x^2)(9)+(9)^2
=x^4-18x^2+81