640=-490t^2+1120t

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Solution for 640=-490t^2+1120t equation:


Simplifying
640 = -490t2 + 1120t

Reorder the terms:
640 = 1120t + -490t2

Solving
640 = 1120t + -490t2

Solving for variable 't'.

Reorder the terms:
640 + -1120t + 490t2 = 1120t + -1120t + -490t2 + 490t2

Combine like terms: 1120t + -1120t = 0
640 + -1120t + 490t2 = 0 + -490t2 + 490t2
640 + -1120t + 490t2 = -490t2 + 490t2

Combine like terms: -490t2 + 490t2 = 0
640 + -1120t + 490t2 = 0

Factor out the Greatest Common Factor (GCF), '10'.
10(64 + -112t + 49t2) = 0

Factor a trinomial.
10((8 + -7t)(8 + -7t)) = 0

Ignore the factor 10.

Subproblem 1

Set the factor '(8 + -7t)' equal to zero and attempt to solve: Simplifying 8 + -7t = 0 Solving 8 + -7t = 0 Move all terms containing t to the left, all other terms to the right. Add '-8' to each side of the equation. 8 + -8 + -7t = 0 + -8 Combine like terms: 8 + -8 = 0 0 + -7t = 0 + -8 -7t = 0 + -8 Combine like terms: 0 + -8 = -8 -7t = -8 Divide each side by '-7'. t = 1.142857143 Simplifying t = 1.142857143

Subproblem 2

Set the factor '(8 + -7t)' equal to zero and attempt to solve: Simplifying 8 + -7t = 0 Solving 8 + -7t = 0 Move all terms containing t to the left, all other terms to the right. Add '-8' to each side of the equation. 8 + -8 + -7t = 0 + -8 Combine like terms: 8 + -8 = 0 0 + -7t = 0 + -8 -7t = 0 + -8 Combine like terms: 0 + -8 = -8 -7t = -8 Divide each side by '-7'. t = 1.142857143 Simplifying t = 1.142857143

Solution

t = {1.142857143, 1.142857143}

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