x^2-30x+225=400

Solution for x^2-30x+225=400 equation:

Simplifying
x2 + -30x + 225 = 400

Reorder the terms:
225 + -30x + x2 = 400

Solving
225 + -30x + x2 = 400

Solving for variable 'x'.

Reorder the terms:
225 + -400 + -30x + x2 = 400 + -400

Combine like terms: 225 + -400 = -175
-175 + -30x + x2 = 400 + -400

Combine like terms: 400 + -400 = 0
-175 + -30x + x2 = 0

Factor a trinomial.
(-5 + -1x)(35 + -1x) = 0

Subproblem 1
Set the factor '(-5 + -1x)' equal to zero and attempt to solve:

Simplifying
-5 + -1x = 0

Solving
-5 + -1x = 0

Move all terms containing x to the left, all other terms to the right.

Add '5' to each side of the equation.
-5 + 5 + -1x = 0 + 5

Combine like terms: -5 + 5 = 0
0 + -1x = 0 + 5
-1x = 0 + 5

Combine like terms: 0 + 5 = 5
-1x = 5

Divide each side by '-1'.
x = -5

Simplifying
x = -5
Subproblem 2
Set the factor '(35 + -1x)' equal to zero and attempt to solve:

Simplifying
35 + -1x = 0

Solving
35 + -1x = 0

Move all terms containing x to the left, all other terms to the right.

Add '-35' to each side of the equation.
35 + -35 + -1x = 0 + -35

Combine like terms: 35 + -35 = 0
0 + -1x = 0 + -35
-1x = 0 + -35

Combine like terms: 0 + -35 = -35
-1x = -35

Divide each side by '-1'.
x = 35

Simplifying
x = 35
Solution
x = {-5, 35}