20x^4+28x^3+12x^2=

Solution for 20x^4+28x^3+12x^2= equation:

Simplifying
20x4 + 28x3 + 12x2 = 0

Reorder the terms:
12x2 + 28x3 + 20x4 = 0

Solving
12x2 + 28x3 + 20x4 = 0

Solving for variable 'x'.

Factor out the Greatest Common Factor (GCF), '4x2'.
4x2(3 + 7x + 5x2) = 0

Ignore the factor 4.
Subproblem 1
Set the factor 'x2' equal to zero and attempt to solve:

Simplifying
x2 = 0

Solving
x2 = 0

Move all terms containing x to the left, all other terms to the right.

Simplifying
x2 = 0

Take the square root of each side:
x = {0}
Subproblem 2
Set the factor '(3 + 7x + 5x2)' equal to zero and attempt to solve:

Simplifying
3 + 7x + 5x2 = 0

Solving
3 + 7x + 5x2 = 0

Begin completing the square.  Divide all terms by
5 the coefficient of the squared term: 

Divide each side by '5'.
0.6 + 1.4x + x2 = 0

Move the constant term to the right:

Add '-0.6' to each side of the equation.
0.6 + 1.4x + -0.6 + x2 = 0 + -0.6

Reorder the terms:
0.6 + -0.6 + 1.4x + x2 = 0 + -0.6

Combine like terms: 0.6 + -0.6 = 0.0
0.0 + 1.4x + x2 = 0 + -0.6
1.4x + x2 = 0 + -0.6

Combine like terms: 0 + -0.6 = -0.6
1.4x + x2 = -0.6

The x term is 1.4x.  Take half its coefficient (0.7).
Square it (0.49) and add it to both sides.

Add '0.49' to each side of the equation.
1.4x + 0.49 + x2 = -0.6 + 0.49

Reorder the terms:
0.49 + 1.4x + x2 = -0.6 + 0.49

Combine like terms: -0.6 + 0.49 = -0.11
0.49 + 1.4x + x2 = -0.11

Factor a perfect square on the left side:
(x + 0.7)(x + 0.7) = -0.11

Can't calculate square root of the right side.

The solution to this equation could not be determined.

This subproblem is being ignored because a solution could not be determined.
Solution
x = {0}