Question

12. If A = 3x -2y + 4x?, B = 7x2 - x - y and
C = x + y, find A + B - C.​

Answer 1

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$b + c - a \\ = ( {5x}^{2} + 3x - 8 + 4x {}^{2} - 7x + 3) - (3x {}^{2} - 4x + 1) \\ = ( {9x}^{2} - 4x - 5) - (3x {}^{2} - 4x + 1) \\ = {9x}^{2} - 4x - 5 - 3x {}^{2} + 4x - 1 \\ = {6x}^{2} - 6$

Answer 2

Answer:

If A = 3x -2y + 4x?, B = 7x2 - x - y and

C = x + y, find A + B - C.