simplify the expression -3(ab-a2)+a2-7ab and find its value, when a=-2,b=7
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-3 (2×7 - 2^2) + 2^2 - 7×2×7
-3 (14 - 4)+ 4 - 98
-3×10 + 4 - 98
-30 -98 + 4
-128 + 4
-124
-3 (14 - 4)+ 4 - 98
-3×10 + 4 - 98
-30 -98 + 4
-128 + 4
-124
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