展开-2sqrt(x+1)(x-8)

解答

展开

- 2 x + 1 (x - 8)

- 2 x x + 1 + 16 x + 1

求解步骤

- 2 x + 1 (x - 8)

使用分配律:

a (b - c) = ab - a c

- 2 x + 1 (x - 8) = - 2 x + 1 x - (- 2 x + 1) \cdot 8

= - 2 x + 1 x - (- 2 x + 1) \cdot 8

化简

- 2 x + 1 x - (- 2 x + 1) \cdot 8 : - 2 x x + 1 + 16 x + 1

= - 2 x x + 1 + 16 x + 1

s im pl i f y (x + 1 - 2) (x + 1 + 2)

e x p an d (1 - \frac{1}{2 e + 1}) e^{x} + (\frac{e ^{3}}{2 e + 1}) e^{- 2 x}

e x p an d \frac{a ^{4} - 3 b ^{2} + 1}{( a ^{2} + b - 1 ) ( a ^{2} - b - 1 )}

e x p an d (2 a + c - d) y (2 a + c - e + 3)

s im pl i f y (\frac{a}{x - 2} + \frac{b}{x + 2}) (x - 2) (x + 2)