=0.40x^2-20x+1000

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Solution for =0.40x^2-20x+1000 equation:


Simplifying
0 = 0.40x2 + -20x + 1000

Reorder the terms:
0 = 1000 + -20x + 0.40x2

Solving
0 = 1000 + -20x + 0.40x2

Solving for variable 'x'.

Combine like terms: 0 + -1000 = -1000
-1000 + 20x + -0.40x2 = 1000 + -20x + 0.40x2 + -1000 + 20x + -0.40x2

Reorder the terms:
-1000 + 20x + -0.40x2 = 1000 + -1000 + -20x + 20x + 0.40x2 + -0.40x2

Combine like terms: 1000 + -1000 = 0
-1000 + 20x + -0.40x2 = 0 + -20x + 20x + 0.40x2 + -0.40x2
-1000 + 20x + -0.40x2 = -20x + 20x + 0.40x2 + -0.40x2

Combine like terms: -20x + 20x = 0
-1000 + 20x + -0.40x2 = 0 + 0.40x2 + -0.40x2
-1000 + 20x + -0.40x2 = 0.40x2 + -0.40x2

Combine like terms: 0.40x2 + -0.40x2 = 0.00
-1000 + 20x + -0.40x2 = 0.00

Begin completing the square.  Divide all terms by
-0.40 the coefficient of the squared term: 

Divide each side by '-0.40'.
2500 + -50x + x2 = 0

Move the constant term to the right:

Add '-2500' to each side of the equation.
2500 + -50x + -2500 + x2 = 0 + -2500

Reorder the terms:
2500 + -2500 + -50x + x2 = 0 + -2500

Combine like terms: 2500 + -2500 = 0
0 + -50x + x2 = 0 + -2500
-50x + x2 = 0 + -2500

Combine like terms: 0 + -2500 = -2500
-50x + x2 = -2500

The x term is -50x.  Take half its coefficient (-25).
Square it (625) and add it to both sides.

Add '625' to each side of the equation.
-50x + 625 + x2 = -2500 + 625

Reorder the terms:
625 + -50x + x2 = -2500 + 625

Combine like terms: -2500 + 625 = -1875
625 + -50x + x2 = -1875

Factor a perfect square on the left side:
(x + -25)(x + -25) = -1875

Can't calculate square root of the right side.

The solution to this equation could not be determined.

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