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x³ + 4x² - 7x + a = (x² + x - 2x - 2) (x + b)
x³ + 4x² - 7x + a = (x² - x - 2) (x + b)
x³ + 4x² - 7x + a = x³ + bx² - x² - bx - 2x - 2b
x³ - x³ + 4x² +x² - 7x + 2x + a = bx² - bx - 2b
5x² - 5x + a = b(x² - x - 2)
5(x² - x + 1/5a) = b(x² - x - 2)
dari persamaan tersebut didapat b = 5, dan 1/5a = -2
1/5a = -2
a = -2 x 5
a = -10
Jawabannya, a = -10 dan b = 5