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f(2)= -18
2² + 3(2) + m = -18
4+6 + m = - 18
m = - 28
f(x) = x² + 3x - 28
f(-1) = n
(-1)² + 3(-1) - 28 = n
1 - 3 - 28 = n
n = -30
m - n = - 28 - (-30)=
m - n = - 28 + 30
m - n = 2
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