Mathematics
Trinny
2015-11-01 05:23:57
can someone please tell me what I am doing wrong?
ANSWERS
isaiahdion14isaiah14
2015-11-01 07:07:45

the last of the multiplications (in line 2 ) should be -4 (-4)  not  3n(-4) (the contents of the second bracket is first multiplied by 3n  the  by -4.) The result should be 9n^2 - 24n + 16

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