0=21x^2+78x-24

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Solution for 0=21x^2+78x-24 equation:


Simplifying
0 = 21x2 + 78x + -24

Reorder the terms:
0 = -24 + 78x + 21x2

Solving
0 = -24 + 78x + 21x2

Solving for variable 'x'.

Combine like terms: 0 + 24 = 24
24 + -78x + -21x2 = -24 + 78x + 21x2 + 24 + -78x + -21x2

Reorder the terms:
24 + -78x + -21x2 = -24 + 24 + 78x + -78x + 21x2 + -21x2

Combine like terms: -24 + 24 = 0
24 + -78x + -21x2 = 0 + 78x + -78x + 21x2 + -21x2
24 + -78x + -21x2 = 78x + -78x + 21x2 + -21x2

Combine like terms: 78x + -78x = 0
24 + -78x + -21x2 = 0 + 21x2 + -21x2
24 + -78x + -21x2 = 21x2 + -21x2

Combine like terms: 21x2 + -21x2 = 0
24 + -78x + -21x2 = 0

Factor out the Greatest Common Factor (GCF), '3'.
3(8 + -26x + -7x2) = 0

Factor a trinomial.
3((2 + -7x)(4 + x)) = 0

Ignore the factor 3.

Subproblem 1

Set the factor '(2 + -7x)' equal to zero and attempt to solve: Simplifying 2 + -7x = 0 Solving 2 + -7x = 0 Move all terms containing x to the left, all other terms to the right. Add '-2' to each side of the equation. 2 + -2 + -7x = 0 + -2 Combine like terms: 2 + -2 = 0 0 + -7x = 0 + -2 -7x = 0 + -2 Combine like terms: 0 + -2 = -2 -7x = -2 Divide each side by '-7'. x = 0.2857142857 Simplifying x = 0.2857142857

Subproblem 2

Set the factor '(4 + x)' equal to zero and attempt to solve: Simplifying 4 + x = 0 Solving 4 + x = 0 Move all terms containing x to the left, all other terms to the right. Add '-4' to each side of the equation. 4 + -4 + x = 0 + -4 Combine like terms: 4 + -4 = 0 0 + x = 0 + -4 x = 0 + -4 Combine like terms: 0 + -4 = -4 x = -4 Simplifying x = -4

Solution

x = {0.2857142857, -4}

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