21a^2-58a+21=0

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Solution for 21a^2-58a+21=0 equation:


Simplifying
21a2 + -58a + 21 = 0

Reorder the terms:
21 + -58a + 21a2 = 0

Solving
21 + -58a + 21a2 = 0

Solving for variable 'a'.

Factor a trinomial.
(3 + -7a)(7 + -3a) = 0

Subproblem 1

Set the factor '(3 + -7a)' equal to zero and attempt to solve: Simplifying 3 + -7a = 0 Solving 3 + -7a = 0 Move all terms containing a to the left, all other terms to the right. Add '-3' to each side of the equation. 3 + -3 + -7a = 0 + -3 Combine like terms: 3 + -3 = 0 0 + -7a = 0 + -3 -7a = 0 + -3 Combine like terms: 0 + -3 = -3 -7a = -3 Divide each side by '-7'. a = 0.4285714286 Simplifying a = 0.4285714286

Subproblem 2

Set the factor '(7 + -3a)' equal to zero and attempt to solve: Simplifying 7 + -3a = 0 Solving 7 + -3a = 0 Move all terms containing a to the left, all other terms to the right. Add '-7' to each side of the equation. 7 + -7 + -3a = 0 + -7 Combine like terms: 7 + -7 = 0 0 + -3a = 0 + -7 -3a = 0 + -7 Combine like terms: 0 + -7 = -7 -3a = -7 Divide each side by '-3'. a = 2.333333333 Simplifying a = 2.333333333

Solution

a = {0.4285714286, 2.333333333}

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