7=7x-4x*x

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Solution for 7=7x-4x*x equation:


Simplifying
7 = 7x + -4x * x

Multiply x * x
7 = 7x + -4x2

Solving
7 = 7x + -4x2

Solving for variable 'x'.

Reorder the terms:
7 + -7x + 4x2 = 7x + -7x + -4x2 + 4x2

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

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

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

Divide each side by '4'.
1.75 + -1.75x + x2 = 0

Move the constant term to the right:

Add '-1.75' to each side of the equation.
1.75 + -1.75x + -1.75 + x2 = 0 + -1.75

Reorder the terms:
1.75 + -1.75 + -1.75x + x2 = 0 + -1.75

Combine like terms: 1.75 + -1.75 = 0.00
0.00 + -1.75x + x2 = 0 + -1.75
-1.75x + x2 = 0 + -1.75

Combine like terms: 0 + -1.75 = -1.75
-1.75x + x2 = -1.75

The x term is -1.75x.  Take half its coefficient (-0.875).
Square it (0.765625) and add it to both sides.

Add '0.765625' to each side of the equation.
-1.75x + 0.765625 + x2 = -1.75 + 0.765625

Reorder the terms:
0.765625 + -1.75x + x2 = -1.75 + 0.765625

Combine like terms: -1.75 + 0.765625 = -0.984375
0.765625 + -1.75x + x2 = -0.984375

Factor a perfect square on the left side:
(x + -0.875)(x + -0.875) = -0.984375

Can't calculate square root of the right side.

The solution to this equation could not be determined.

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