Factorise :
16 x⁴ - 81
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Answer:(4x²+9)(2x+3)(2x-3)
Explanation:
16x²-81
=(4x²)²-(9)²
=(4x²+9)(4x²-9). [(a²-b²)= (a+b)(a-b)]
=[(4x²+9){(2x)²-(3)²}]
=[(4x²+9){(2x+3)(2x-3)}]
=(4x²+9)(2x+3)(2x-3)
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