(7x^2+9x+10)-(3x^2+4x)=

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Solution for (7x^2+9x+10)-(3x^2+4x)= equation:


Simplifying
(7x2 + 9x + 10) + -1(3x2 + 4x) = 0

Reorder the terms:
(10 + 9x + 7x2) + -1(3x2 + 4x) = 0

Remove parenthesis around (10 + 9x + 7x2)
10 + 9x + 7x2 + -1(3x2 + 4x) = 0

Reorder the terms:
10 + 9x + 7x2 + -1(4x + 3x2) = 0
10 + 9x + 7x2 + (4x * -1 + 3x2 * -1) = 0
10 + 9x + 7x2 + (-4x + -3x2) = 0

Reorder the terms:
10 + 9x + -4x + 7x2 + -3x2 = 0

Combine like terms: 9x + -4x = 5x
10 + 5x + 7x2 + -3x2 = 0

Combine like terms: 7x2 + -3x2 = 4x2
10 + 5x + 4x2 = 0

Solving
10 + 5x + 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'.
2.5 + 1.25x + x2 = 0

Move the constant term to the right:

Add '-2.5' to each side of the equation.
2.5 + 1.25x + -2.5 + x2 = 0 + -2.5

Reorder the terms:
2.5 + -2.5 + 1.25x + x2 = 0 + -2.5

Combine like terms: 2.5 + -2.5 = 0.0
0.0 + 1.25x + x2 = 0 + -2.5
1.25x + x2 = 0 + -2.5

Combine like terms: 0 + -2.5 = -2.5
1.25x + x2 = -2.5

The x term is 1.25x.  Take half its coefficient (0.625).
Square it (0.390625) and add it to both sides.

Add '0.390625' to each side of the equation.
1.25x + 0.390625 + x2 = -2.5 + 0.390625

Reorder the terms:
0.390625 + 1.25x + x2 = -2.5 + 0.390625

Combine like terms: -2.5 + 0.390625 = -2.109375
0.390625 + 1.25x + x2 = -2.109375

Factor a perfect square on the left side:
(x + 0.625)(x + 0.625) = -2.109375

Can't calculate square root of the right side.

The solution to this equation could not be determined.

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