0=4x^2+21x

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Solution for 0=4x^2+21x equation:


Simplifying
0 = 4x2 + 21x

Reorder the terms:
0 = 21x + 4x2

Solving
0 = 21x + 4x2

Solving for variable 'x'.
Remove the zero:
-21x + -4x2 = 21x + 4x2 + -21x + -4x2

Reorder the terms:
-21x + -4x2 = 21x + -21x + 4x2 + -4x2

Combine like terms: 21x + -21x = 0
-21x + -4x2 = 0 + 4x2 + -4x2
-21x + -4x2 = 4x2 + -4x2

Combine like terms: 4x2 + -4x2 = 0
-21x + -4x2 = 0

Factor out the Greatest Common Factor (GCF), '-1x'.
-1x(21 + 4x) = 0

Ignore the factor -1.

Subproblem 1

Set the factor 'x' equal to zero and attempt to solve: Simplifying x = 0 Solving x = 0 Move all terms containing x to the left, all other terms to the right. Simplifying x = 0

Subproblem 2

Set the factor '(21 + 4x)' equal to zero and attempt to solve: Simplifying 21 + 4x = 0 Solving 21 + 4x = 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 + 4x = 0 + -21 Combine like terms: 21 + -21 = 0 0 + 4x = 0 + -21 4x = 0 + -21 Combine like terms: 0 + -21 = -21 4x = -21 Divide each side by '4'. x = -5.25 Simplifying x = -5.25

Solution

x = {0, -5.25}

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