44 because multiply by 2 and you get 2x/8 = 11 then multiply by 8 and you get 2x=88 so x=44
To find the value of x, isolate the x first,
5x + 6 = 2x +15
Subtract 6 to both sides because whatever you do on one side you would always to on the other side.
5x = 2x + 9
Subtract 2x from both sides
3x = 9
Divide to isolate the x
x = 3 is your answer
Answer:

Step-by-step explanation:
Given
First Polygon:


Second Polygon


Required
Find x
Since both polygons are similar, then:

For the first:

For the second

Equate both ratios

Express as fraction

Cross Multiply

Solve for x



If the number is n then
square of 2 times a number
square of 2n
(2n)²
that was your mistake, because (2n)²=4n², not 2n²
the result is 81
(2n)²=81
square root both sides
remember positive and negative roots
2n=+/-9
divide by 2
n=+/-4.5
n=4.5 or -4.5