40x-x^2=400

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Solution for 40x-x^2=400 equation:


Simplifying
40x + -1x2 = 400

Solving
40x + -1x2 = 400

Solving for variable 'x'.

Reorder the terms:
-400 + 40x + -1x2 = 400 + -400

Combine like terms: 400 + -400 = 0
-400 + 40x + -1x2 = 0

Factor a trinomial.
(-20 + x)(20 + -1x) = 0

Subproblem 1

Set the factor '(-20 + x)' equal to zero and attempt to solve: Simplifying -20 + x = 0 Solving -20 + x = 0 Move all terms containing x to the left, all other terms to the right. Add '20' to each side of the equation. -20 + 20 + x = 0 + 20 Combine like terms: -20 + 20 = 0 0 + x = 0 + 20 x = 0 + 20 Combine like terms: 0 + 20 = 20 x = 20 Simplifying x = 20

Subproblem 2

Set the factor '(20 + -1x)' equal to zero and attempt to solve: Simplifying 20 + -1x = 0 Solving 20 + -1x = 0 Move all terms containing x to the left, all other terms to the right. Add '-20' to each side of the equation. 20 + -20 + -1x = 0 + -20 Combine like terms: 20 + -20 = 0 0 + -1x = 0 + -20 -1x = 0 + -20 Combine like terms: 0 + -20 = -20 -1x = -20 Divide each side by '-1'. x = 20 Simplifying x = 20

Solution

x = {20, 20}

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