Answer:
= -12
Step-by-step explanation:
Rearrange terms
2
Distribute
3
Combine like terms
4
Rearrange terms
5
Subtract
1
5
15
15
from both sides of the equation
6
Simplify
7
Subtract
2
2x
2x
from both sides of the equation
8
Simplify
9
Divide both sides of the equation by the same term
10
Simplify
Sn=A1(1-r^n)/(1-r)
Sum of a finite geometric series formula
We know the sum, number of terms and rate, so you plug those in.
-255=A1(1-(-4)^4))/(1-(-4)
-255=A1(1-256)/5
-255=A1(-255)/5
-1275=A1(-255)
5=A1
Hope this helped! Let me know if you have any questions.
25x² + 1 = 5
25x² + 1 - 5 = 0
25x² - 4 = 0 By difference of two squares
(5x)² - (2)² = 0
(5x - 2)(5x + 2) = 0
5x - 2 = 0 or 5x + 2 = 0
5x = 0 + 2 5x = 0 - 2
5x = 2 5x = -2
x = 2/5 x = -2/5
x = 0.4 x = -0.4
x = + 0.4 or -0.4
The midpoint of 18.6 and 18.5 is 18.55
