please answer this question I need the explanation too
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Answer:
77x^2+17x-4.
Step-by-step explanation:
= 9x(3x+1)^2-4(x-1)^2
=9x[(3x)^2+2(3x)(1)+(1)^2]- 4[(x)^2-2(x)(1)+(1)^2]
=9x(3x^2+6x+1)-4(x^2-2x+1)
=27x^2+54x^2+9x-4x^2+8x-4
=81x^2-4x^2+17x-4
=77x^2+17x-4
Hope it will help you.
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