SOLUTION: Perform the indicated operations: 1. (x + 5)(x - 6) - (x-7)(x+8) 2. (1/4x-3)(1/4x+3) 3. (x+1)(x+4)(x-1)(x-4) Thanks.

Algebra ->  Exponents -> SOLUTION: Perform the indicated operations: 1. (x + 5)(x - 6) - (x-7)(x+8) 2. (1/4x-3)(1/4x+3) 3. (x+1)(x+4)(x-1)(x-4) Thanks.      Log On


   

Question 763202: Perform the indicated operations:
1. (x + 5)(x - 6) - (x-7)(x+8)
2. (1/4x-3)(1/4x+3)
3. (x+1)(x+4)(x-1)(x-4)
Thanks.
Answer by Cromlix(4381) About Me  (Show Source):
You can put this solution on YOUR website!
1) (x + 5)(x - 6) - (x-7)(x+8)
(x^2 + x - 30) - (x^2 + x - 56)
x^2 + x - 30 - x^2 - x + 56
= 26
2) (1/4x-3)(1/4x+3)
1/ 16x^2 - 9

3) (x+1)(x+4)(x-1)(x-4)
(x^2 + 5x + 4( (x - 1)(x - 4)
(x^3 + 5x^2 + 4x - x^2 - 5x - 4)(x - 4)
(x^3 + 4x^2 - x - 4)(x - 4)
(x^4 + 4x^3 - x^2 - 4x - 4x^4 - 16x^2 + 4x + 16
-3x^4 + 4x^3 - 17x^2 + 16