2x^2+19x=21

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Solution for 2x^2+19x=21 equation:


Simplifying
2x2 + 19x = 21

Reorder the terms:
19x + 2x2 = 21

Solving
19x + 2x2 = 21

Solving for variable 'x'.

Reorder the terms:
-21 + 19x + 2x2 = 21 + -21

Combine like terms: 21 + -21 = 0
-21 + 19x + 2x2 = 0

Factor a trinomial.
(-21 + -2x)(1 + -1x) = 0

Subproblem 1

Set the factor '(-21 + -2x)' equal to zero and attempt to solve: Simplifying -21 + -2x = 0 Solving -21 + -2x = 0 Move all terms containing x to the left, all other terms to the right. Add '21' to each side of the equation. -21 + 21 + -2x = 0 + 21 Combine like terms: -21 + 21 = 0 0 + -2x = 0 + 21 -2x = 0 + 21 Combine like terms: 0 + 21 = 21 -2x = 21 Divide each side by '-2'. x = -10.5 Simplifying x = -10.5

Subproblem 2

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

Solution

x = {-10.5, 1}

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