化简 3(a+1)^2-(a+1)+4

解答

化简

3 (a + 1)^{2} - (a + 1) + 4

3 a^{2} + 5 a + 6

求解步骤

3 (a + 1)^{2} - (a + 1) + 4

使用分配律:

- (a + b) = - a - b

- (a + 1) = - a - 1

= 3 (a + 1)^{2} - a - 1 + 4

展开

3 (a + 1)^{2} : 3 a^{2} + 6 a + 3

= 3 a^{2} + 6 a + 3 - a - 1 + 4

对同类项分组

= 3 a^{2} + 6 a - a + 3 - 1 + 4

s im pl i f y 310648

f a c t or - 4 - 5 i

s im pl i f y \frac{( - 24 x + 16 )}{8}

s im pl i f y 25 + 16

s im pl i f y (2 x^{2} - 9 x + 2) + (3 x^{2} + 7 x - 1)