simplify =(3x+5)²-(3x-5)²
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(3x+5)²-(3x-5)²
= (a+b)^2-(a-b)^2
= a^2+2ab+b^2-(a^2-2ab+b^2)
= a^2+2ab+b^2-a^2+2ab-b^2)
= 4ab
=(3x+5)²-(3x-5)²=4×3x×5=60x
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