21x^2=34x+55

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Solution for 21x^2=34x+55 equation:


Simplifying
21x2 = 34x + 55

Reorder the terms:
21x2 = 55 + 34x

Solving
21x2 = 55 + 34x

Solving for variable 'x'.

Reorder the terms:
-55 + -34x + 21x2 = 55 + 34x + -55 + -34x

Reorder the terms:
-55 + -34x + 21x2 = 55 + -55 + 34x + -34x

Combine like terms: 55 + -55 = 0
-55 + -34x + 21x2 = 0 + 34x + -34x
-55 + -34x + 21x2 = 34x + -34x

Combine like terms: 34x + -34x = 0
-55 + -34x + 21x2 = 0

Factor a trinomial.
(-1 + -1x)(55 + -21x) = 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 '(55 + -21x)' equal to zero and attempt to solve: Simplifying 55 + -21x = 0 Solving 55 + -21x = 0 Move all terms containing x to the left, all other terms to the right. Add '-55' to each side of the equation. 55 + -55 + -21x = 0 + -55 Combine like terms: 55 + -55 = 0 0 + -21x = 0 + -55 -21x = 0 + -55 Combine like terms: 0 + -55 = -55 -21x = -55 Divide each side by '-21'. x = 2.619047619 Simplifying x = 2.619047619

Solution

x = {-1, 2.619047619}

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