How do you prove (3x+2)2 is equivalent to (3x+6)(3x-2)+16 i have tried expanding the brackets but I'm still really stuck thankyou in advance

asked Mar 16, 2015 40.2k views

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How do you prove (3x+2)2 is equivalent to (3x+6)(3x-2)+16

i have tried expanding the brackets but I'm still really stuck
thankyou in advance

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$(3x+2)^2=9x^2+12x+4\\\\ (3x+6)(3x-2)+16=\\ 9x^2-6x+18x-12+16=\\ 9x^2+12x+4$

Hokhy Tann answered Mar 22, 2015

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