4x^2+3x=30

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Solution for 4x^2+3x=30 equation:


Simplifying
4x2 + 3x = 30

Reorder the terms:
3x + 4x2 = 30

Solving
3x + 4x2 = 30

Solving for variable 'x'.

Reorder the terms:
-30 + 3x + 4x2 = 30 + -30

Combine like terms: 30 + -30 = 0
-30 + 3x + 4x2 = 0

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

Divide each side by '4'.
-7.5 + 0.75x + x2 = 0

Move the constant term to the right:

Add '7.5' to each side of the equation.
-7.5 + 0.75x + 7.5 + x2 = 0 + 7.5

Reorder the terms:
-7.5 + 7.5 + 0.75x + x2 = 0 + 7.5

Combine like terms: -7.5 + 7.5 = 0.0
0.0 + 0.75x + x2 = 0 + 7.5
0.75x + x2 = 0 + 7.5

Combine like terms: 0 + 7.5 = 7.5
0.75x + x2 = 7.5

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 = 7.5 + 0.140625

Reorder the terms:
0.140625 + 0.75x + x2 = 7.5 + 0.140625

Combine like terms: 7.5 + 0.140625 = 7.640625
0.140625 + 0.75x + x2 = 7.640625

Factor a perfect square on the left side:
(x + 0.375)(x + 0.375) = 7.640625

Calculate the square root of the right side: 2.764168048

Break this problem into two subproblems by setting 
(x + 0.375) equal to 2.764168048 and -2.764168048.

Subproblem 1

x + 0.375 = 2.764168048 Simplifying x + 0.375 = 2.764168048 Reorder the terms: 0.375 + x = 2.764168048 Solving 0.375 + x = 2.764168048 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 = 2.764168048 + -0.375 Combine like terms: 0.375 + -0.375 = 0.000 0.000 + x = 2.764168048 + -0.375 x = 2.764168048 + -0.375 Combine like terms: 2.764168048 + -0.375 = 2.389168048 x = 2.389168048 Simplifying x = 2.389168048

Subproblem 2

x + 0.375 = -2.764168048 Simplifying x + 0.375 = -2.764168048 Reorder the terms: 0.375 + x = -2.764168048 Solving 0.375 + x = -2.764168048 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 = -2.764168048 + -0.375 Combine like terms: 0.375 + -0.375 = 0.000 0.000 + x = -2.764168048 + -0.375 x = -2.764168048 + -0.375 Combine like terms: -2.764168048 + -0.375 = -3.139168048 x = -3.139168048 Simplifying x = -3.139168048

Solution

The solution to the problem is based on the solutions from the subproblems. x = {2.389168048, -3.139168048}

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