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3(2x-3)(2x+3)-(x-4)^2

Guest Jul 18, 2017
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3 [(2x-3)(2x+3)] - [ (x-4)^2 ]

 

3 [ 4x^2 - 9 ] - [ (x - 4) (x - 4) ]

 

12x^2 - 27 - [ x^2 - 8x + 16 ]

 

12x^2 - 27 - x^2 + 8x - 16      combine like terms

 

11x^2 + 8x - 43

 

 

cool cool cool

CPhill  Jul 18, 2017

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