展开 (x-4)(sqrt(x)-2)

解答

展开

(x - 4) (x - 2)

x x - 2 x - 4 x + 8

求解步骤

(x - 4) (x - 2)

Apply FOIL method

(x - 4) (x - 2) : x x - 2 x - 4 x + 8

= x x - 2 x - 4 x + 8

e x p an d (x + 2) e^{\frac{1}{x}}

s im pl i f y (3 - x 2)^{2}

e x p an d \frac{d}{d x} ((2 x^{2} - 1) e^{- x^{2}}) + 4

e x p an d \frac{x ^{2}}{( x - 2 ) ^{3}}

e x p an d (t cos (t)) \cdot (cos (t) - t sin (t))