4(x*x)-7x-19=0

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Solution for 4(x*x)-7x-19=0 equation:


Simplifying
4(x * x) + -7x + -19 = 0

Multiply x * x
4(x2) + -7x + -19 = 0

Reorder the terms:
-19 + -7x + 4x2 = 0

Solving
-19 + -7x + 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'.
-4.75 + -1.75x + x2 = 0

Move the constant term to the right:

Add '4.75' to each side of the equation.
-4.75 + -1.75x + 4.75 + x2 = 0 + 4.75

Reorder the terms:
-4.75 + 4.75 + -1.75x + x2 = 0 + 4.75

Combine like terms: -4.75 + 4.75 = 0.00
0.00 + -1.75x + x2 = 0 + 4.75
-1.75x + x2 = 0 + 4.75

Combine like terms: 0 + 4.75 = 4.75
-1.75x + x2 = 4.75

The x term is -1.75x.  Take half its coefficient (-0.875).
Square it (0.765625) and add it to both sides.

Add '0.765625' to each side of the equation.
-1.75x + 0.765625 + x2 = 4.75 + 0.765625

Reorder the terms:
0.765625 + -1.75x + x2 = 4.75 + 0.765625

Combine like terms: 4.75 + 0.765625 = 5.515625
0.765625 + -1.75x + x2 = 5.515625

Factor a perfect square on the left side:
(x + -0.875)(x + -0.875) = 5.515625

Calculate the square root of the right side: 2.348536779

Break this problem into two subproblems by setting 
(x + -0.875) equal to 2.348536779 and -2.348536779.

Subproblem 1

x + -0.875 = 2.348536779 Simplifying x + -0.875 = 2.348536779 Reorder the terms: -0.875 + x = 2.348536779 Solving -0.875 + x = 2.348536779 Solving for variable 'x'. Move all terms containing x to the left, all other terms to the right. Add '0.875' to each side of the equation. -0.875 + 0.875 + x = 2.348536779 + 0.875 Combine like terms: -0.875 + 0.875 = 0.000 0.000 + x = 2.348536779 + 0.875 x = 2.348536779 + 0.875 Combine like terms: 2.348536779 + 0.875 = 3.223536779 x = 3.223536779 Simplifying x = 3.223536779

Subproblem 2

x + -0.875 = -2.348536779 Simplifying x + -0.875 = -2.348536779 Reorder the terms: -0.875 + x = -2.348536779 Solving -0.875 + x = -2.348536779 Solving for variable 'x'. Move all terms containing x to the left, all other terms to the right. Add '0.875' to each side of the equation. -0.875 + 0.875 + x = -2.348536779 + 0.875 Combine like terms: -0.875 + 0.875 = 0.000 0.000 + x = -2.348536779 + 0.875 x = -2.348536779 + 0.875 Combine like terms: -2.348536779 + 0.875 = -1.473536779 x = -1.473536779 Simplifying x = -1.473536779

Solution

The solution to the problem is based on the solutions from the subproblems. x = {3.223536779, -1.473536779}

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