4a^2-21=25a

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Solution for 4a^2-21=25a equation:


Simplifying
4a2 + -21 = 25a

Reorder the terms:
-21 + 4a2 = 25a

Solving
-21 + 4a2 = 25a

Solving for variable 'a'.

Reorder the terms:
-21 + -25a + 4a2 = 25a + -25a

Combine like terms: 25a + -25a = 0
-21 + -25a + 4a2 = 0

Factor a trinomial.
(-3 + -4a)(7 + -1a) = 0

Subproblem 1

Set the factor '(-3 + -4a)' equal to zero and attempt to solve: Simplifying -3 + -4a = 0 Solving -3 + -4a = 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 + -4a = 0 + 3 Combine like terms: -3 + 3 = 0 0 + -4a = 0 + 3 -4a = 0 + 3 Combine like terms: 0 + 3 = 3 -4a = 3 Divide each side by '-4'. a = -0.75 Simplifying a = -0.75

Subproblem 2

Set the factor '(7 + -1a)' equal to zero and attempt to solve: Simplifying 7 + -1a = 0 Solving 7 + -1a = 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 + -1a = 0 + -7 Combine like terms: 7 + -7 = 0 0 + -1a = 0 + -7 -1a = 0 + -7 Combine like terms: 0 + -7 = -7 -1a = -7 Divide each side by '-1'. a = 7 Simplifying a = 7

Solution

a = {-0.75, 7}

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