3x+10=9x-20,(x+5)2=?
Answers
Step-by-step explanation:
Simplifying
3x + -10 = 9x + 20
Reorder the terms:
-10 + 3x = 9x + 20
Reorder the terms:
-10 + 3x = 20 + 9x
Solving
-10 + 3x = 20 + 9x
Solving for variable 'x'.
Move all terms containing x to the left, all other terms to the right.
Add '-9x' to each side of the equation.
-10 + 3x + -9x = 20 + 9x + -9x
Combine like terms: 3x + -9x = -6x
-10 + -6x = 20 + 9x + -9x
Combine like terms: 9x + -9x = 0
-10 + -6x = 20 + 0
-10 + -6x = 20
Add '10' to each side of the equation.
-10 + 10 + -6x = 20 + 10
Combine like terms: -10 + 10 = 0
0 + -6x = 20 + 10
-6x = 20 + 10
Combine like terms: 20 + 10 = 30
-6x = 30
Divide each side by '-6'.
x = -5
Simplifying
x = -5
Step-by-step explanation:
3x+10=9x-20
10+20=9x-3x
30=6x
30÷6=x
5=x
(X+5)2=(5+5)2
=10×2
=20
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