Answer:
The correct option is C
Step-by-step explanation:
if f(x)= x3 + x2 - 20x
Replace f(x) by y
y = x3 + x2 - 20x
0 =x3 + x2 - 20x
x3 + x2 - 20x = 0
Take out x as a common:
x(x2+x-20)=0
Find factors of x2+x+20.
x(x^2+4x-5x-20) = 0
x{x(x+4)-5(x+4)}=0
x(x+4)(x-5)=0
Set x= 0
x=0 , x+4=0 , x-5 =0
x=0, x=0-4 , x=0+5
x=0, x= -4, x=5
x=(0,5,-4)
The correct option is C....
Answer:
x=−3
Step-by-step explanation:
−x+3=6
Step 1: Subtract 3 from both sides.
−x+3−3=6−3
−x=3
Step 2: Divide both sides by -1.
−x
−1
=
3
−1
x=−3
Answer:
x = 7 x = -1
Step-by-step explanation:
3|x − 3| + 2 = 14
Subtract 2 from each side
3|x − 3| + 2 -2= 14-2
3|x − 3| = 12
Divide by 3
3|x − 3| /3 = 12/3
|x − 3| = 4
Now the absolute value has a positive and negative solution.
x-3 = 4 x-3 = -4
Add 3 to each side
x-3+3 = 4+3 x-3+3 = -4+3
x = 7 x = -1
Answer:
5.4
Step-by-step explanation: