x=-7x^2+3x+9

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Solution for x=-7x^2+3x+9 equation:


Simplifying
x = -7x2 + 3x + 9

Reorder the terms:
x = 9 + 3x + -7x2

Solving
x = 9 + 3x + -7x2

Solving for variable 'x'.

Reorder the terms:
-9 + x + -3x + 7x2 = 9 + 3x + -7x2 + -9 + -3x + 7x2

Combine like terms: x + -3x = -2x
-9 + -2x + 7x2 = 9 + 3x + -7x2 + -9 + -3x + 7x2

Reorder the terms:
-9 + -2x + 7x2 = 9 + -9 + 3x + -3x + -7x2 + 7x2

Combine like terms: 9 + -9 = 0
-9 + -2x + 7x2 = 0 + 3x + -3x + -7x2 + 7x2
-9 + -2x + 7x2 = 3x + -3x + -7x2 + 7x2

Combine like terms: 3x + -3x = 0
-9 + -2x + 7x2 = 0 + -7x2 + 7x2
-9 + -2x + 7x2 = -7x2 + 7x2

Combine like terms: -7x2 + 7x2 = 0
-9 + -2x + 7x2 = 0

Factor a trinomial.
(-1 + -1x)(9 + -7x) = 0

Subproblem 1

Set the factor '(-1 + -1x)' equal to zero and attempt to solve: Simplifying -1 + -1x = 0 Solving -1 + -1x = 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 + -1x = 0 + 1 Combine like terms: -1 + 1 = 0 0 + -1x = 0 + 1 -1x = 0 + 1 Combine like terms: 0 + 1 = 1 -1x = 1 Divide each side by '-1'. x = -1 Simplifying x = -1

Subproblem 2

Set the factor '(9 + -7x)' equal to zero and attempt to solve: Simplifying 9 + -7x = 0 Solving 9 + -7x = 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 + -7x = 0 + -9 Combine like terms: 9 + -9 = 0 0 + -7x = 0 + -9 -7x = 0 + -9 Combine like terms: 0 + -9 = -9 -7x = -9 Divide each side by '-7'. x = 1.285714286 Simplifying x = 1.285714286

Solution

x = {-1, 1.285714286}

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