4x^2-3x=28

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Solution for 4x^2-3x=28 equation:


Simplifying
4x2 + -3x = 28

Reorder the terms:
-3x + 4x2 = 28

Solving
-3x + 4x2 = 28

Solving for variable 'x'.

Reorder the terms:
-28 + -3x + 4x2 = 28 + -28

Combine like terms: 28 + -28 = 0
-28 + -3x + 4x2 = 0

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

Divide each side by '4'.
-7 + -0.75x + x2 = 0

Move the constant term to the right:

Add '7' to each side of the equation.
-7 + -0.75x + 7 + x2 = 0 + 7

Reorder the terms:
-7 + 7 + -0.75x + x2 = 0 + 7

Combine like terms: -7 + 7 = 0
0 + -0.75x + x2 = 0 + 7
-0.75x + x2 = 0 + 7

Combine like terms: 0 + 7 = 7
-0.75x + x2 = 7

The x term is -0.75x.  Take half its coefficient (-0.375).
Square it (0.140625) and add it to both sides.

Add '0.140625' to each side of the equation.
-0.75x + 0.140625 + x2 = 7 + 0.140625

Reorder the terms:
0.140625 + -0.75x + x2 = 7 + 0.140625

Combine like terms: 7 + 0.140625 = 7.140625
0.140625 + -0.75x + x2 = 7.140625

Factor a perfect square on the left side:
(x + -0.375)(x + -0.375) = 7.140625

Calculate the square root of the right side: 2.672194791

Break this problem into two subproblems by setting 
(x + -0.375) equal to 2.672194791 and -2.672194791.

Subproblem 1

x + -0.375 = 2.672194791 Simplifying x + -0.375 = 2.672194791 Reorder the terms: -0.375 + x = 2.672194791 Solving -0.375 + x = 2.672194791 Solving for variable 'x'. Move all terms containing x to the left, all other terms to the right. Add '0.375' to each side of the equation. -0.375 + 0.375 + x = 2.672194791 + 0.375 Combine like terms: -0.375 + 0.375 = 0.000 0.000 + x = 2.672194791 + 0.375 x = 2.672194791 + 0.375 Combine like terms: 2.672194791 + 0.375 = 3.047194791 x = 3.047194791 Simplifying x = 3.047194791

Subproblem 2

x + -0.375 = -2.672194791 Simplifying x + -0.375 = -2.672194791 Reorder the terms: -0.375 + x = -2.672194791 Solving -0.375 + x = -2.672194791 Solving for variable 'x'. Move all terms containing x to the left, all other terms to the right. Add '0.375' to each side of the equation. -0.375 + 0.375 + x = -2.672194791 + 0.375 Combine like terms: -0.375 + 0.375 = 0.000 0.000 + x = -2.672194791 + 0.375 x = -2.672194791 + 0.375 Combine like terms: -2.672194791 + 0.375 = -2.297194791 x = -2.297194791 Simplifying x = -2.297194791

Solution

The solution to the problem is based on the solutions from the subproblems. x = {3.047194791, -2.297194791}

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