bjr
53
A = x*2 + x*x + 5*8 + 5*(-3x) = 2x + x² + 40 - 15x = x² - 13x + 40
B = -2*5 + -2*(-4x) + 3x*(-8) + 3x*x = -10 + 8x - 24x + 3x² = 3x² - 16x - 10
C = -x*3x - x*7 - 5*9x -5*(-1) = -3x² - 7x - 45x + 5 = -3x² - 52x + 5
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bjr
53
A = x*2 + x*x + 5*8 + 5*(-3x) = 2x + x² + 40 - 15x = x² - 13x + 40
B = -2*5 + -2*(-4x) + 3x*(-8) + 3x*x = -10 + 8x - 24x + 3x² = 3x² - 16x - 10
C = -x*3x - x*7 - 5*9x -5*(-1) = -3x² - 7x - 45x + 5 = -3x² - 52x + 5