0=-4.9x^2+8x+1.5

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Solution for 0=-4.9x^2+8x+1.5 equation:


Simplifying
0 = -4.9x2 + 8x + 1.5

Reorder the terms:
0 = 1.5 + 8x + -4.9x2

Solving
0 = 1.5 + 8x + -4.9x2

Solving for variable 'x'.

Combine like terms: 0 + -1.5 = -1.5
-1.5 + -8x + 4.9x2 = 1.5 + 8x + -4.9x2 + -1.5 + -8x + 4.9x2

Reorder the terms:
-1.5 + -8x + 4.9x2 = 1.5 + -1.5 + 8x + -8x + -4.9x2 + 4.9x2

Combine like terms: 1.5 + -1.5 = 0.0
-1.5 + -8x + 4.9x2 = 0.0 + 8x + -8x + -4.9x2 + 4.9x2
-1.5 + -8x + 4.9x2 = 8x + -8x + -4.9x2 + 4.9x2

Combine like terms: 8x + -8x = 0
-1.5 + -8x + 4.9x2 = 0 + -4.9x2 + 4.9x2
-1.5 + -8x + 4.9x2 = -4.9x2 + 4.9x2

Combine like terms: -4.9x2 + 4.9x2 = 0.0
-1.5 + -8x + 4.9x2 = 0.0

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

Divide each side by '4.9'.
-0.306122449 + -1.632653061x + x2 = 0

Move the constant term to the right:

Add '0.306122449' to each side of the equation.
-0.306122449 + -1.632653061x + 0.306122449 + x2 = 0 + 0.306122449

Reorder the terms:
-0.306122449 + 0.306122449 + -1.632653061x + x2 = 0 + 0.306122449

Combine like terms: -0.306122449 + 0.306122449 = 0.000000000
0.000000000 + -1.632653061x + x2 = 0 + 0.306122449
-1.632653061x + x2 = 0 + 0.306122449

Combine like terms: 0 + 0.306122449 = 0.306122449
-1.632653061x + x2 = 0.306122449

The x term is -1.632653061x.  Take half its coefficient (-0.8163265305).
Square it (0.6663890044) and add it to both sides.

Add '0.6663890044' to each side of the equation.
-1.632653061x + 0.6663890044 + x2 = 0.306122449 + 0.6663890044

Reorder the terms:
0.6663890044 + -1.632653061x + x2 = 0.306122449 + 0.6663890044

Combine like terms: 0.306122449 + 0.6663890044 = 0.9725114534
0.6663890044 + -1.632653061x + x2 = 0.9725114534

Factor a perfect square on the left side:
(x + -0.8163265305)(x + -0.8163265305) = 0.9725114534

Calculate the square root of the right side: 0.986159953

Break this problem into two subproblems by setting 
(x + -0.8163265305) equal to 0.986159953 and -0.986159953.

Subproblem 1

x + -0.8163265305 = 0.986159953 Simplifying x + -0.8163265305 = 0.986159953 Reorder the terms: -0.8163265305 + x = 0.986159953 Solving -0.8163265305 + x = 0.986159953 Solving for variable 'x'. Move all terms containing x to the left, all other terms to the right. Add '0.8163265305' to each side of the equation. -0.8163265305 + 0.8163265305 + x = 0.986159953 + 0.8163265305 Combine like terms: -0.8163265305 + 0.8163265305 = 0.0000000000 0.0000000000 + x = 0.986159953 + 0.8163265305 x = 0.986159953 + 0.8163265305 Combine like terms: 0.986159953 + 0.8163265305 = 1.8024864835 x = 1.8024864835 Simplifying x = 1.8024864835

Subproblem 2

x + -0.8163265305 = -0.986159953 Simplifying x + -0.8163265305 = -0.986159953 Reorder the terms: -0.8163265305 + x = -0.986159953 Solving -0.8163265305 + x = -0.986159953 Solving for variable 'x'. Move all terms containing x to the left, all other terms to the right. Add '0.8163265305' to each side of the equation. -0.8163265305 + 0.8163265305 + x = -0.986159953 + 0.8163265305 Combine like terms: -0.8163265305 + 0.8163265305 = 0.0000000000 0.0000000000 + x = -0.986159953 + 0.8163265305 x = -0.986159953 + 0.8163265305 Combine like terms: -0.986159953 + 0.8163265305 = -0.1698334225 x = -0.1698334225 Simplifying x = -0.1698334225

Solution

The solution to the problem is based on the solutions from the subproblems. x = {1.8024864835, -0.1698334225}

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