7x^2-19x-10=19.4

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Solution for 7x^2-19x-10=19.4 equation:


Simplifying
7x2 + -19x + -10 = 19.4

Reorder the terms:
-10 + -19x + 7x2 = 19.4

Solving
-10 + -19x + 7x2 = 19.4

Solving for variable 'x'.

Reorder the terms:
-10 + -19.4 + -19x + 7x2 = 19.4 + -19.4

Combine like terms: -10 + -19.4 = -29.4
-29.4 + -19x + 7x2 = 19.4 + -19.4

Combine like terms: 19.4 + -19.4 = 0.0
-29.4 + -19x + 7x2 = 0.0

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

Divide each side by '7'.
-4.2 + -2.714285714x + x2 = 0.0

Move the constant term to the right:

Add '4.2' to each side of the equation.
-4.2 + -2.714285714x + 4.2 + x2 = 0.0 + 4.2

Reorder the terms:
-4.2 + 4.2 + -2.714285714x + x2 = 0.0 + 4.2

Combine like terms: -4.2 + 4.2 = 0.0
0.0 + -2.714285714x + x2 = 0.0 + 4.2
-2.714285714x + x2 = 0.0 + 4.2

Combine like terms: 0.0 + 4.2 = 4.2
-2.714285714x + x2 = 4.2

The x term is -2.714285714x.  Take half its coefficient (-1.357142857).
Square it (1.841836734) and add it to both sides.

Add '1.841836734' to each side of the equation.
-2.714285714x + 1.841836734 + x2 = 4.2 + 1.841836734

Reorder the terms:
1.841836734 + -2.714285714x + x2 = 4.2 + 1.841836734

Combine like terms: 4.2 + 1.841836734 = 6.041836734
1.841836734 + -2.714285714x + x2 = 6.041836734

Factor a perfect square on the left side:
(x + -1.357142857)(x + -1.357142857) = 6.041836734

Calculate the square root of the right side: 2.458014795

Break this problem into two subproblems by setting 
(x + -1.357142857) equal to 2.458014795 and -2.458014795.

Subproblem 1

x + -1.357142857 = 2.458014795 Simplifying x + -1.357142857 = 2.458014795 Reorder the terms: -1.357142857 + x = 2.458014795 Solving -1.357142857 + x = 2.458014795 Solving for variable 'x'. Move all terms containing x to the left, all other terms to the right. Add '1.357142857' to each side of the equation. -1.357142857 + 1.357142857 + x = 2.458014795 + 1.357142857 Combine like terms: -1.357142857 + 1.357142857 = 0.000000000 0.000000000 + x = 2.458014795 + 1.357142857 x = 2.458014795 + 1.357142857 Combine like terms: 2.458014795 + 1.357142857 = 3.815157652 x = 3.815157652 Simplifying x = 3.815157652

Subproblem 2

x + -1.357142857 = -2.458014795 Simplifying x + -1.357142857 = -2.458014795 Reorder the terms: -1.357142857 + x = -2.458014795 Solving -1.357142857 + x = -2.458014795 Solving for variable 'x'. Move all terms containing x to the left, all other terms to the right. Add '1.357142857' to each side of the equation. -1.357142857 + 1.357142857 + x = -2.458014795 + 1.357142857 Combine like terms: -1.357142857 + 1.357142857 = 0.000000000 0.000000000 + x = -2.458014795 + 1.357142857 x = -2.458014795 + 1.357142857 Combine like terms: -2.458014795 + 1.357142857 = -1.100871938 x = -1.100871938 Simplifying x = -1.100871938

Solution

The solution to the problem is based on the solutions from the subproblems. x = {3.815157652, -1.100871938}

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