What expression must be added to 5a^2-3a+12 to get 9a^2-7
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Step-by-step explanation:
Let the number to be added be X
so
5a^2 -3a + 12 + X = 9a2 - 7
=》 X = 9a^2 - 5a^2 + 3a - 7 - 12
=》 X = 4 a^2 + 3a - 18
Ans: 4a2 + 3a - 18
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