The answer is 7.
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Depends on what the questions were.
plot 4,-5 2,2 and 7,-5 on a graph than connect the vertex
12^2 + 12 = 144 + 12 = 156 or, 12^2 + 12 = 12(12 + 1) = (12)(13) = 156
x^2 + 24x = 0 add to both sides 12^2 (144) x^2 + 24x + 12^2 = 12^2 use the formula (a + b)^2 = a^2 + 2ab + b^2; (x + 12)^2 = 12^2 x + 12 = +, - 12 subtract 12 to both sides; x = 0 or x = -24
2 x 6 = 12 2 x 2 x 3 = 12