Answer:
a. (-11a +5b - 5) + (5a -7b+8) = -6a -2b+3
b. 6y-2
c. 28s³ - s - 124
d. 7x² - 8x - 3
e. x can be any number
Step-by-step explanation:
a. Solution:
-11a +5b - 5 and 5a -7b+8
To find: add.
Solution:
-11a +5b - 5 and 5a -7b+8
(-11a +5b - 5) = (5a -7b+8)
= -6a -2b+3
b. given
15y+7
+ -9y - 9
- 15y + 7 + (-9y - 9)
- 15y + 7 - 9y - 9
- 15y - 9y + 7 - 9
= 6y - 2
c. Analysis: 8s³ + 15s³ - 9s + 12 = 5s³ - 11² + 8s - 15
= (8 + 15 + 5) s³ - s + 12 - 11² - 15
= 28s³ - s 124
d. Solution:
6x² - 3x - 11
+ x² - 5x + 8
{6x² + x²} 7x²
{-3x +(-5x)} -8x
{-11 + 8} -3
7x² - 8x - 3
e. Solution:
x² + 2x + 3 ≥ 0
x² + 2x + 1 - 1 + 3 ≥ 0
(x + 1)² ≥ -3
So x can be any number
(Solve inequality)
