a(a-21)-100=0

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Solution for a(a-21)-100=0 equation:


Simplifying
a(a + -21) + -100 = 0

Reorder the terms:
a(-21 + a) + -100 = 0
(-21 * a + a * a) + -100 = 0
(-21a + a2) + -100 = 0

Reorder the terms:
-100 + -21a + a2 = 0

Solving
-100 + -21a + a2 = 0

Solving for variable 'a'.

Factor a trinomial.
(-4 + -1a)(25 + -1a) = 0

Subproblem 1

Set the factor '(-4 + -1a)' equal to zero and attempt to solve: Simplifying -4 + -1a = 0 Solving -4 + -1a = 0 Move all terms containing a to the left, all other terms to the right. Add '4' to each side of the equation. -4 + 4 + -1a = 0 + 4 Combine like terms: -4 + 4 = 0 0 + -1a = 0 + 4 -1a = 0 + 4 Combine like terms: 0 + 4 = 4 -1a = 4 Divide each side by '-1'. a = -4 Simplifying a = -4

Subproblem 2

Set the factor '(25 + -1a)' equal to zero and attempt to solve: Simplifying 25 + -1a = 0 Solving 25 + -1a = 0 Move all terms containing a to the left, all other terms to the right. Add '-25' to each side of the equation. 25 + -25 + -1a = 0 + -25 Combine like terms: 25 + -25 = 0 0 + -1a = 0 + -25 -1a = 0 + -25 Combine like terms: 0 + -25 = -25 -1a = -25 Divide each side by '-1'. a = 25 Simplifying a = 25

Solution

a = {-4, 25}

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