2n2 + 15n + 7
= 2n2 + n + 14n + 7
= (2n2 + n) + (14n + 7)
= n(2n + 1) + 7(2n + 1)
= (2n + 1)(n + 7)
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(7-3)^2 plus (7-1)^2 = 16+36
x + 7 + y
8k +2k + 7 = 10k + 7
A minus and a minus makes a plus A plus and a plus makes a plus A minus and a plus or plus and a minus makes a minus 7 - -2 is a minus and a minus Therefore the answer is 7 + 2 = 9
7 + 1x + 5 = 12 + x