In order to solve this problem, you must factor.
You multiply via the FOIL system.
F: first 4M X M = 4MM (Msquared)
O: ouslide 4M X 14 = 56M
I: Inside -7 X M = -7M
L: Last -7 X 14 = -98
When you combine all of these like terms you get the final solution:
4M2(squared) + 49M - 98
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