factorise 16^x4 - 81^y4
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Answer:
=(4x²+9y²)(2x+3y)(2x-3y)
Step-by-step explanation:
16x⁴-81y⁴
=(2x)⁴-(3y)⁴
=[(2x)²]²-[(3y)²]²
=[(2x)²+(3y)²][(2x)²-(3y)²]
=(4x²+9y²)(2x+3y)(2x-3y)
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