3x^2-15x=x^2-7

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Solution for 3x^2-15x=x^2-7 equation:


Simplifying
3x2 + -15x = x2 + -7

Reorder the terms:
-15x + 3x2 = x2 + -7

Reorder the terms:
-15x + 3x2 = -7 + x2

Solving
-15x + 3x2 = -7 + x2

Solving for variable 'x'.

Reorder the terms:
7 + -15x + 3x2 + -1x2 = -7 + x2 + 7 + -1x2

Combine like terms: 3x2 + -1x2 = 2x2
7 + -15x + 2x2 = -7 + x2 + 7 + -1x2

Reorder the terms:
7 + -15x + 2x2 = -7 + 7 + x2 + -1x2

Combine like terms: -7 + 7 = 0
7 + -15x + 2x2 = 0 + x2 + -1x2
7 + -15x + 2x2 = x2 + -1x2

Combine like terms: x2 + -1x2 = 0
7 + -15x + 2x2 = 0

Factor a trinomial.
(1 + -2x)(7 + -1x) = 0

Subproblem 1

Set the factor '(1 + -2x)' equal to zero and attempt to solve: Simplifying 1 + -2x = 0 Solving 1 + -2x = 0 Move all terms containing x to the left, all other terms to the right. Add '-1' to each side of the equation. 1 + -1 + -2x = 0 + -1 Combine like terms: 1 + -1 = 0 0 + -2x = 0 + -1 -2x = 0 + -1 Combine like terms: 0 + -1 = -1 -2x = -1 Divide each side by '-2'. x = 0.5 Simplifying x = 0.5

Subproblem 2

Set the factor '(7 + -1x)' equal to zero and attempt to solve: Simplifying 7 + -1x = 0 Solving 7 + -1x = 0 Move all terms containing x to the left, all other terms to the right. Add '-7' to each side of the equation. 7 + -7 + -1x = 0 + -7 Combine like terms: 7 + -7 = 0 0 + -1x = 0 + -7 -1x = 0 + -7 Combine like terms: 0 + -7 = -7 -1x = -7 Divide each side by '-1'. x = 7 Simplifying x = 7

Solution

x = {0.5, 7}

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