(350-10a)(a-21)=400

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Solution for (350-10a)(a-21)=400 equation:


Simplifying
(350 + -10a)(a + -21) = 400

Reorder the terms:
(350 + -10a)(-21 + a) = 400

Multiply (350 + -10a) * (-21 + a)
(350(-21 + a) + -10a * (-21 + a)) = 400
((-21 * 350 + a * 350) + -10a * (-21 + a)) = 400
((-7350 + 350a) + -10a * (-21 + a)) = 400
(-7350 + 350a + (-21 * -10a + a * -10a)) = 400
(-7350 + 350a + (210a + -10a2)) = 400

Combine like terms: 350a + 210a = 560a
(-7350 + 560a + -10a2) = 400

Solving
-7350 + 560a + -10a2 = 400

Solving for variable 'a'.

Reorder the terms:
-7350 + -400 + 560a + -10a2 = 400 + -400

Combine like terms: -7350 + -400 = -7750
-7750 + 560a + -10a2 = 400 + -400

Combine like terms: 400 + -400 = 0
-7750 + 560a + -10a2 = 0

Factor out the Greatest Common Factor (GCF), '10'.
10(-775 + 56a + -1a2) = 0

Factor a trinomial.
10((-31 + a)(25 + -1a)) = 0

Ignore the factor 10.

Subproblem 1

Set the factor '(-31 + a)' equal to zero and attempt to solve: Simplifying -31 + a = 0 Solving -31 + a = 0 Move all terms containing a to the left, all other terms to the right. Add '31' to each side of the equation. -31 + 31 + a = 0 + 31 Combine like terms: -31 + 31 = 0 0 + a = 0 + 31 a = 0 + 31 Combine like terms: 0 + 31 = 31 a = 31 Simplifying a = 31

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 = {31, 25}

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