Simplify (3x+5)^2-(3x-5)^2
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=(3x+ 5)^2 - (3x -5)^2
(a+b)^2 = a^2+2ab +b^2
(a- b)^2 = a^2-2ab+b^2
=[ (3x)^2 + 2*3x * 5 + (5)^2 ] - [ ( 3x)^2 - 2* 3x * -5 + (5)^2]
= [ (9)x^2 + 30x + 25] - [ (9)x^2 - 30x +25]
= (9)^2 + 30x +25 - (9)x^2 +30x -25
= 30x + 30x
= 60x
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