b^2-10b=-21

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Solution for b^2-10b=-21 equation:


Simplifying
b2 + -10b = -21

Reorder the terms:
-10b + b2 = -21

Solving
-10b + b2 = -21

Solving for variable 'b'.

Reorder the terms:
21 + -10b + b2 = -21 + 21

Combine like terms: -21 + 21 = 0
21 + -10b + b2 = 0

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

Subproblem 1

Set the factor '(3 + -1b)' equal to zero and attempt to solve: Simplifying 3 + -1b = 0 Solving 3 + -1b = 0 Move all terms containing b to the left, all other terms to the right. Add '-3' to each side of the equation. 3 + -3 + -1b = 0 + -3 Combine like terms: 3 + -3 = 0 0 + -1b = 0 + -3 -1b = 0 + -3 Combine like terms: 0 + -3 = -3 -1b = -3 Divide each side by '-1'. b = 3 Simplifying b = 3

Subproblem 2

Set the factor '(7 + -1b)' equal to zero and attempt to solve: Simplifying 7 + -1b = 0 Solving 7 + -1b = 0 Move all terms containing b to the left, all other terms to the right. Add '-7' to each side of the equation. 7 + -7 + -1b = 0 + -7 Combine like terms: 7 + -7 = 0 0 + -1b = 0 + -7 -1b = 0 + -7 Combine like terms: 0 + -7 = -7 -1b = -7 Divide each side by '-1'. b = 7 Simplifying b = 7

Solution

b = {3, 7}

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