Given a = x & # 179; - 5x & # 178;, B = x & # 178; - 11x + 6, find: 1. A + 2B; 2. When x = - 1, find a + 5B

Given a = x & # 179; - 5x & # 178;, B = x & # 178; - 11x + 6, find: 1. A + 2B; 2. When x = - 1, find a + 5B

(1) Original formula = x3-5x2 + 2 (x2-11x + 6)
=x3-3x2-22x+12；
（2）A+5B=x3-5x2+5（x2-11x+6）
=x3-55x+30；
When x = - 1,
The original formula = - 1 + 55 + 30 = 84

Special higher order equation
If many roots are the same after solving, do you want to write X1 = x2 = xxxxx, or just write one
In addition to the case of no solution, there are several roots if the highest number of times is a few

If the roots are the same, write X1 = x2 =... Xn = some number
And the highest number is a few, there are several roots

To solve the equation of higher degree (4 times), it is urgent to solve it
x²+(-2x²+√3x)²+(x-√3/2)²+(-2x+√3x)²=3/4

Don't ask me to write the process, I can only give you the answer, there is no need to calculate a total of four solutions, I use matlab to calculate, just spend some time copying, X1 = 0x2 = (3 ^ (1 / 2) / 3 - 2 / 3) / ((17 * 3 ^ (1 / 2)) / 72 + (3 ^ (1 / 2) * (3 ^ (1 / 2) - 3)) / 6 + ((17 * 3 ^ (1 / 2)) / 72 + (3 ^ (1 / 2) * (3