m-? (a+b)².
(3x - 5)² + (4x + 12)² + mx=
(3x - 5)² +mx+ (4x + 12)²=
((3x-5)+(4x+12))²=(7x+7)²=49x²+98x+49.
mx=98x, m=98.
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m-? (a+b)².
(3x - 5)² + (4x + 12)² + mx=
(3x - 5)² +mx+ (4x + 12)²=
((3x-5)+(4x+12))²=(7x+7)²=49x²+98x+49.
mx=98x, m=98.