What is the sum of 5x 2 + 3x − 7 and 12x + 12

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We can only add like terms. In this case we have 3x and 12x which added together make 15x. And we have the constants -7 and 12 which added together is the same as 12-7=5. There is no other x² term so the sum is 5x²+15x+5.

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