25x^2-40x+9=-7

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Solution for 25x^2-40x+9=-7 equation:


Simplifying
25x2 + -40x + 9 = -7

Reorder the terms:
9 + -40x + 25x2 = -7

Solving
9 + -40x + 25x2 = -7

Solving for variable 'x'.

Reorder the terms:
9 + 7 + -40x + 25x2 = -7 + 7

Combine like terms: 9 + 7 = 16
16 + -40x + 25x2 = -7 + 7

Combine like terms: -7 + 7 = 0
16 + -40x + 25x2 = 0

Factor a trinomial.
(4 + -5x)(4 + -5x) = 0

Subproblem 1

Set the factor '(4 + -5x)' equal to zero and attempt to solve: Simplifying 4 + -5x = 0 Solving 4 + -5x = 0 Move all terms containing x to the left, all other terms to the right. Add '-4' to each side of the equation. 4 + -4 + -5x = 0 + -4 Combine like terms: 4 + -4 = 0 0 + -5x = 0 + -4 -5x = 0 + -4 Combine like terms: 0 + -4 = -4 -5x = -4 Divide each side by '-5'. x = 0.8 Simplifying x = 0.8

Subproblem 2

Set the factor '(4 + -5x)' equal to zero and attempt to solve: Simplifying 4 + -5x = 0 Solving 4 + -5x = 0 Move all terms containing x to the left, all other terms to the right. Add '-4' to each side of the equation. 4 + -4 + -5x = 0 + -4 Combine like terms: 4 + -4 = 0 0 + -5x = 0 + -4 -5x = 0 + -4 Combine like terms: 0 + -4 = -4 -5x = -4 Divide each side by '-5'. x = 0.8 Simplifying x = 0.8

Solution

x = {0.8, 0.8}

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