factorise the following
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25x²-40x+16 (a-b)²=a²-2ab+b²
(5x)²-2×5x×4 (4)²
(5x-4)²
16x²-81y² a²-b²=(a+b)(a-b)
(4x)²-(9y)²=(4x+9y)(4x-9y)
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