Factorise:
25(2x+y)^2 - 16(x-y)^2
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25(2x+y)2−16(x−y)2
=[{5(2x+y)}2−{4(x−y)}2]
=[(10x+5y−4x+4y)(10x+5y+4x−4y)]
=(6x+9y)(14x+y)
=[{5(2x+y)}2−{4(x−y)}2]
=[(10x+5y−4x+4y)(10x+5y+4x−4y)]
=(6x+9y)(14x+y)
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