化简 (\sqrt[3]{a}-5)(\sqrt[3]{a}+9)

解答

化简

(3 a - 5) (3 a + 9)

(3 a)^{2} + 4 3 a - 45

求解步骤

(3 a - 5) (3 a + 9)

Apply FOIL method

(3 a - 5) (3 a + 9) : (3 a)^{2} + 4 3 a - 45

= (3 a)^{2} + 4 3 a - 45

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

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

e x p an d (3 - 1) + (3 - 1) i

s im pl i f y (- 2) - (1 - i) (\frac{1 + i}{2 - 2})

e x p an d \frac{15 ( x - 2 ) ^{2}}{2}