2x+5)^2 - 40x=(2x*5)^2
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Step-by-step explanation:
(a+b)²-4ab=(a-b)²
Here a=2x and b=5
So, (2x+5)²-4(2x)(5)=(2x-5)²
(2x+5)²-40x=(2x-5)²
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