0=x^2-4x-45

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Solution for 0=x^2-4x-45 equation:


Simplifying
0 = x2 + -4x + -45

Reorder the terms:
0 = -45 + -4x + x2

Solving
0 = -45 + -4x + x2

Solving for variable 'x'.

Combine like terms: 0 + 45 = 45
45 + 4x + -1x2 = -45 + -4x + x2 + 45 + 4x + -1x2

Reorder the terms:
45 + 4x + -1x2 = -45 + 45 + -4x + 4x + x2 + -1x2

Combine like terms: -45 + 45 = 0
45 + 4x + -1x2 = 0 + -4x + 4x + x2 + -1x2
45 + 4x + -1x2 = -4x + 4x + x2 + -1x2

Combine like terms: -4x + 4x = 0
45 + 4x + -1x2 = 0 + x2 + -1x2
45 + 4x + -1x2 = x2 + -1x2

Combine like terms: x2 + -1x2 = 0
45 + 4x + -1x2 = 0

Factor a trinomial.
(9 + -1x)(5 + x) = 0

Subproblem 1

Set the factor '(9 + -1x)' equal to zero and attempt to solve: Simplifying 9 + -1x = 0 Solving 9 + -1x = 0 Move all terms containing x to the left, all other terms to the right. Add '-9' to each side of the equation. 9 + -9 + -1x = 0 + -9 Combine like terms: 9 + -9 = 0 0 + -1x = 0 + -9 -1x = 0 + -9 Combine like terms: 0 + -9 = -9 -1x = -9 Divide each side by '-1'. x = 9 Simplifying x = 9

Subproblem 2

Set the factor '(5 + x)' equal to zero and attempt to solve: Simplifying 5 + x = 0 Solving 5 + x = 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 + x = 0 + -5 Combine like terms: 5 + -5 = 0 0 + x = 0 + -5 x = 0 + -5 Combine like terms: 0 + -5 = -5 x = -5 Simplifying x = -5

Solution

x = {9, -5}

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