4.9x^2+15x-1.2=0

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Solution for 4.9x^2+15x-1.2=0 equation:


Simplifying
4.9x2 + 15x + -1.2 = 0

Reorder the terms:
-1.2 + 15x + 4.9x2 = 0

Solving
-1.2 + 15x + 4.9x2 = 0

Solving for variable 'x'.

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

Divide each side by '4.9'.
-0.2448979592 + 3.06122449x + x2 = 0

Move the constant term to the right:

Add '0.2448979592' to each side of the equation.
-0.2448979592 + 3.06122449x + 0.2448979592 + x2 = 0 + 0.2448979592

Reorder the terms:
-0.2448979592 + 0.2448979592 + 3.06122449x + x2 = 0 + 0.2448979592

Combine like terms: -0.2448979592 + 0.2448979592 = 0.0000000000
0.0000000000 + 3.06122449x + x2 = 0 + 0.2448979592
3.06122449x + x2 = 0 + 0.2448979592

Combine like terms: 0 + 0.2448979592 = 0.2448979592
3.06122449x + x2 = 0.2448979592

The x term is 3.06122449x.  Take half its coefficient (1.530612245).
Square it (2.342773845) and add it to both sides.

Add '2.342773845' to each side of the equation.
3.06122449x + 2.342773845 + x2 = 0.2448979592 + 2.342773845

Reorder the terms:
2.342773845 + 3.06122449x + x2 = 0.2448979592 + 2.342773845

Combine like terms: 0.2448979592 + 2.342773845 = 2.5876718042
2.342773845 + 3.06122449x + x2 = 2.5876718042

Factor a perfect square on the left side:
(x + 1.530612245)(x + 1.530612245) = 2.5876718042

Calculate the square root of the right side: 1.608624196

Break this problem into two subproblems by setting 
(x + 1.530612245) equal to 1.608624196 and -1.608624196.

Subproblem 1

x + 1.530612245 = 1.608624196 Simplifying x + 1.530612245 = 1.608624196 Reorder the terms: 1.530612245 + x = 1.608624196 Solving 1.530612245 + x = 1.608624196 Solving for variable 'x'. Move all terms containing x to the left, all other terms to the right. Add '-1.530612245' to each side of the equation. 1.530612245 + -1.530612245 + x = 1.608624196 + -1.530612245 Combine like terms: 1.530612245 + -1.530612245 = 0.000000000 0.000000000 + x = 1.608624196 + -1.530612245 x = 1.608624196 + -1.530612245 Combine like terms: 1.608624196 + -1.530612245 = 0.078011951 x = 0.078011951 Simplifying x = 0.078011951

Subproblem 2

x + 1.530612245 = -1.608624196 Simplifying x + 1.530612245 = -1.608624196 Reorder the terms: 1.530612245 + x = -1.608624196 Solving 1.530612245 + x = -1.608624196 Solving for variable 'x'. Move all terms containing x to the left, all other terms to the right. Add '-1.530612245' to each side of the equation. 1.530612245 + -1.530612245 + x = -1.608624196 + -1.530612245 Combine like terms: 1.530612245 + -1.530612245 = 0.000000000 0.000000000 + x = -1.608624196 + -1.530612245 x = -1.608624196 + -1.530612245 Combine like terms: -1.608624196 + -1.530612245 = -3.139236441 x = -3.139236441 Simplifying x = -3.139236441

Solution

The solution to the problem is based on the solutions from the subproblems. x = {0.078011951, -3.139236441}

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