7t^2+21t-28=0

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Solution for 7t^2+21t-28=0 equation:


Simplifying
7t2 + 21t + -28 = 0

Reorder the terms:
-28 + 21t + 7t2 = 0

Solving
-28 + 21t + 7t2 = 0

Solving for variable 't'.

Factor out the Greatest Common Factor (GCF), '7'.
7(-4 + 3t + t2) = 0

Factor a trinomial.
7((-4 + -1t)(1 + -1t)) = 0

Ignore the factor 7.

Subproblem 1

Set the factor '(-4 + -1t)' equal to zero and attempt to solve: Simplifying -4 + -1t = 0 Solving -4 + -1t = 0 Move all terms containing t to the left, all other terms to the right. Add '4' to each side of the equation. -4 + 4 + -1t = 0 + 4 Combine like terms: -4 + 4 = 0 0 + -1t = 0 + 4 -1t = 0 + 4 Combine like terms: 0 + 4 = 4 -1t = 4 Divide each side by '-1'. t = -4 Simplifying t = -4

Subproblem 2

Set the factor '(1 + -1t)' equal to zero and attempt to solve: Simplifying 1 + -1t = 0 Solving 1 + -1t = 0 Move all terms containing t to the left, all other terms to the right. Add '-1' to each side of the equation. 1 + -1 + -1t = 0 + -1 Combine like terms: 1 + -1 = 0 0 + -1t = 0 + -1 -1t = 0 + -1 Combine like terms: 0 + -1 = -1 -1t = -1 Divide each side by '-1'. t = 1 Simplifying t = 1

Solution

t = {-4, 1}

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