If x=3 and y=-1 find the value (9y^2-4x^2)×(81y^4+36x^2y^2+16x^4)
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(9y²-4x²)×(81y⁴+36x²y²+16x⁴)
= {9×(-1)²-4×(3)²} ×{81×(-1)⁴+36×(3)²×(-1)²+16×(3)⁴}
= {(9×1)-(4×9)}×{(81×1)+(36×9×1)+(16×81)}
= {9-36}×{81+324+1296}
= -27 ×1701
= -45927
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