4x^2+3x-15=0

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Solution for 4x^2+3x-15=0 equation:


Simplifying
4x2 + 3x + -15 = 0

Reorder the terms:
-15 + 3x + 4x2 = 0

Solving
-15 + 3x + 4x2 = 0

Solving for variable 'x'.

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

Divide each side by '4'.
-3.75 + 0.75x + x2 = 0

Move the constant term to the right:

Add '3.75' to each side of the equation.
-3.75 + 0.75x + 3.75 + x2 = 0 + 3.75

Reorder the terms:
-3.75 + 3.75 + 0.75x + x2 = 0 + 3.75

Combine like terms: -3.75 + 3.75 = 0.00
0.00 + 0.75x + x2 = 0 + 3.75
0.75x + x2 = 0 + 3.75

Combine like terms: 0 + 3.75 = 3.75
0.75x + x2 = 3.75

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 = 3.75 + 0.140625

Reorder the terms:
0.140625 + 0.75x + x2 = 3.75 + 0.140625

Combine like terms: 3.75 + 0.140625 = 3.890625
0.140625 + 0.75x + x2 = 3.890625

Factor a perfect square on the left side:
(x + 0.375)(x + 0.375) = 3.890625

Calculate the square root of the right side: 1.97246673

Break this problem into two subproblems by setting 
(x + 0.375) equal to 1.97246673 and -1.97246673.

Subproblem 1

x + 0.375 = 1.97246673 Simplifying x + 0.375 = 1.97246673 Reorder the terms: 0.375 + x = 1.97246673 Solving 0.375 + x = 1.97246673 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 = 1.97246673 + -0.375 Combine like terms: 0.375 + -0.375 = 0.000 0.000 + x = 1.97246673 + -0.375 x = 1.97246673 + -0.375 Combine like terms: 1.97246673 + -0.375 = 1.59746673 x = 1.59746673 Simplifying x = 1.59746673

Subproblem 2

x + 0.375 = -1.97246673 Simplifying x + 0.375 = -1.97246673 Reorder the terms: 0.375 + x = -1.97246673 Solving 0.375 + x = -1.97246673 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 = -1.97246673 + -0.375 Combine like terms: 0.375 + -0.375 = 0.000 0.000 + x = -1.97246673 + -0.375 x = -1.97246673 + -0.375 Combine like terms: -1.97246673 + -0.375 = -2.34746673 x = -2.34746673 Simplifying x = -2.34746673

Solution

The solution to the problem is based on the solutions from the subproblems. x = {1.59746673, -2.34746673}

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