28x(x-1)=-21x^2+5

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Solution for 28x(x-1)=-21x^2+5 equation:


Simplifying
28x(x + -1) = -21x2 + 5

Reorder the terms:
28x(-1 + x) = -21x2 + 5
(-1 * 28x + x * 28x) = -21x2 + 5
(-28x + 28x2) = -21x2 + 5

Reorder the terms:
-28x + 28x2 = 5 + -21x2

Solving
-28x + 28x2 = 5 + -21x2

Solving for variable 'x'.

Reorder the terms:
-5 + -28x + 28x2 + 21x2 = 5 + -21x2 + -5 + 21x2

Combine like terms: 28x2 + 21x2 = 49x2
-5 + -28x + 49x2 = 5 + -21x2 + -5 + 21x2

Reorder the terms:
-5 + -28x + 49x2 = 5 + -5 + -21x2 + 21x2

Combine like terms: 5 + -5 = 0
-5 + -28x + 49x2 = 0 + -21x2 + 21x2
-5 + -28x + 49x2 = -21x2 + 21x2

Combine like terms: -21x2 + 21x2 = 0
-5 + -28x + 49x2 = 0

Factor a trinomial.
(-1 + -7x)(5 + -7x) = 0

Subproblem 1

Set the factor '(-1 + -7x)' equal to zero and attempt to solve: Simplifying -1 + -7x = 0 Solving -1 + -7x = 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 + -7x = 0 + 1 Combine like terms: -1 + 1 = 0 0 + -7x = 0 + 1 -7x = 0 + 1 Combine like terms: 0 + 1 = 1 -7x = 1 Divide each side by '-7'. x = -0.1428571429 Simplifying x = -0.1428571429

Subproblem 2

Set the factor '(5 + -7x)' equal to zero and attempt to solve: Simplifying 5 + -7x = 0 Solving 5 + -7x = 0 Move all terms containing x to the left, all other terms to the right. Add '-5' to each side of the equation. 5 + -5 + -7x = 0 + -5 Combine like terms: 5 + -5 = 0 0 + -7x = 0 + -5 -7x = 0 + -5 Combine like terms: 0 + -5 = -5 -7x = -5 Divide each side by '-7'. x = 0.7142857143 Simplifying x = 0.7142857143

Solution

x = {-0.1428571429, 0.7142857143}

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