(7x^2-2x-1)-(5x^2-x-3)=

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Solution for (7x^2-2x-1)-(5x^2-x-3)= equation:


Simplifying
(7x2 + -2x + -1) + -1(5x2 + -1x + -3) = 0

Reorder the terms:
(-1 + -2x + 7x2) + -1(5x2 + -1x + -3) = 0

Remove parenthesis around (-1 + -2x + 7x2)
-1 + -2x + 7x2 + -1(5x2 + -1x + -3) = 0

Reorder the terms:
-1 + -2x + 7x2 + -1(-3 + -1x + 5x2) = 0
-1 + -2x + 7x2 + (-3 * -1 + -1x * -1 + 5x2 * -1) = 0
-1 + -2x + 7x2 + (3 + 1x + -5x2) = 0

Reorder the terms:
-1 + 3 + -2x + 1x + 7x2 + -5x2 = 0

Combine like terms: -1 + 3 = 2
2 + -2x + 1x + 7x2 + -5x2 = 0

Combine like terms: -2x + 1x = -1x
2 + -1x + 7x2 + -5x2 = 0

Combine like terms: 7x2 + -5x2 = 2x2
2 + -1x + 2x2 = 0

Solving
2 + -1x + 2x2 = 0

Solving for variable 'x'.

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

Divide each side by '2'.
1 + -0.5x + x2 = 0

Move the constant term to the right:

Add '-1' to each side of the equation.
1 + -0.5x + -1 + x2 = 0 + -1

Reorder the terms:
1 + -1 + -0.5x + x2 = 0 + -1

Combine like terms: 1 + -1 = 0
0 + -0.5x + x2 = 0 + -1
-0.5x + x2 = 0 + -1

Combine like terms: 0 + -1 = -1
-0.5x + x2 = -1

The x term is -0.5x.  Take half its coefficient (-0.25).
Square it (0.0625) and add it to both sides.

Add '0.0625' to each side of the equation.
-0.5x + 0.0625 + x2 = -1 + 0.0625

Reorder the terms:
0.0625 + -0.5x + x2 = -1 + 0.0625

Combine like terms: -1 + 0.0625 = -0.9375
0.0625 + -0.5x + x2 = -0.9375

Factor a perfect square on the left side:
(x + -0.25)(x + -0.25) = -0.9375

Can't calculate square root of the right side.

The solution to this equation could not be determined.

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