(7u^2-4u+1)+(-2u^2+5u+3)=

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Solution for (7u^2-4u+1)+(-2u^2+5u+3)= equation:


Simplifying
(7u2 + -4u + 1) + (-2u2 + 5u + 3) = 0

Reorder the terms:
(1 + -4u + 7u2) + (-2u2 + 5u + 3) = 0

Remove parenthesis around (1 + -4u + 7u2)
1 + -4u + 7u2 + (-2u2 + 5u + 3) = 0

Reorder the terms:
1 + -4u + 7u2 + (3 + 5u + -2u2) = 0

Remove parenthesis around (3 + 5u + -2u2)
1 + -4u + 7u2 + 3 + 5u + -2u2 = 0

Reorder the terms:
1 + 3 + -4u + 5u + 7u2 + -2u2 = 0

Combine like terms: 1 + 3 = 4
4 + -4u + 5u + 7u2 + -2u2 = 0

Combine like terms: -4u + 5u = 1u
4 + 1u + 7u2 + -2u2 = 0

Combine like terms: 7u2 + -2u2 = 5u2
4 + 1u + 5u2 = 0

Solving
4 + 1u + 5u2 = 0

Solving for variable 'u'.

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

Divide each side by '5'.
0.8 + 0.2u + u2 = 0

Move the constant term to the right:

Add '-0.8' to each side of the equation.
0.8 + 0.2u + -0.8 + u2 = 0 + -0.8

Reorder the terms:
0.8 + -0.8 + 0.2u + u2 = 0 + -0.8

Combine like terms: 0.8 + -0.8 = 0.0
0.0 + 0.2u + u2 = 0 + -0.8
0.2u + u2 = 0 + -0.8

Combine like terms: 0 + -0.8 = -0.8
0.2u + u2 = -0.8

The u term is 0.2u.  Take half its coefficient (0.1).
Square it (0.01) and add it to both sides.

Add '0.01' to each side of the equation.
0.2u + 0.01 + u2 = -0.8 + 0.01

Reorder the terms:
0.01 + 0.2u + u2 = -0.8 + 0.01

Combine like terms: -0.8 + 0.01 = -0.79
0.01 + 0.2u + u2 = -0.79

Factor a perfect square on the left side:
(u + 0.1)(u + 0.1) = -0.79

Can't calculate square root of the right side.

The solution to this equation could not be determined.

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