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Simplifying (2b + 5)(b + -4) = 0 Reorder the terms: (5 + 2b)(b + -4) = 0 Reorder the terms: (5 + 2b)(-4 + b) = 0 Multiply (5 + 2b) * (-4 + b) (5(-4 + b) + 2b * (-4 + b)) = 0 ((-4 * 5 + b * 5) + 2b * (-4 + b)) = 0 ((-20 + 5b) + 2b * (-4 + b)) = 0 (-20 + 5b + (-4 * 2b + b * 2b)) = 0 (-20 + 5b + (-8b + 2b2)) = 0 Combine like terms: 5b + -8b = -3b (-20 + -3b + 2b2) = 0 Solving -20 + -3b + 2b2 = 0 Solving for variable 'b'. Factor a trinomial. (-5 + -2b)(4 + -1b) = 0Subproblem 1
Set the factor '(-5 + -2b)' equal to zero and attempt to solve: Simplifying -5 + -2b = 0 Solving -5 + -2b = 0 Move all terms containing b to the left, all other terms to the right. Add '5' to each side of the equation. -5 + 5 + -2b = 0 + 5 Combine like terms: -5 + 5 = 0 0 + -2b = 0 + 5 -2b = 0 + 5 Combine like terms: 0 + 5 = 5 -2b = 5 Divide each side by '-2'. b = -2.5 Simplifying b = -2.5Subproblem 2
Set the factor '(4 + -1b)' equal to zero and attempt to solve: Simplifying 4 + -1b = 0 Solving 4 + -1b = 0 Move all terms containing b to the left, all other terms to the right. Add '-4' to each side of the equation. 4 + -4 + -1b = 0 + -4 Combine like terms: 4 + -4 = 0 0 + -1b = 0 + -4 -1b = 0 + -4 Combine like terms: 0 + -4 = -4 -1b = -4 Divide each side by '-1'. b = 4 Simplifying b = 4Solution
b = {-2.5, 4}
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