please answer this immediately fast question (2x+5)²- (2x-5)²
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(2x+5)²-(2x-5)²
[ break in (a+b)²= a²+b²+2ab & (a-b)²= a²+b²-2ab ]
= 4x²+25+20x - 4x²+25-20x
= 50
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