factorise 4x²+20xy+25y²
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=>4x²+20xy+25y²
by using (a+b)²= a²+2ab + b²
=> (2x)² + 2 (4x)(5y) + (5y)²
=> (2x + 5y)²
or
=> (2x+5y)(2x+5y)
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