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Simplifying n(n + -3) = 7(4) Reorder the terms: n(-3 + n) = 7(4) (-3 * n + n * n) = 7(4) (-3n + n2) = 7(4) Multiply 7 * 4 -3n + n2 = 28 Solving -3n + n2 = 28 Solving for variable 'n'. Reorder the terms: -28 + -3n + n2 = 28 + -28 Combine like terms: 28 + -28 = 0 -28 + -3n + n2 = 0 Factor a trinomial. (-4 + -1n)(7 + -1n) = 0Subproblem 1
Set the factor '(-4 + -1n)' equal to zero and attempt to solve: Simplifying -4 + -1n = 0 Solving -4 + -1n = 0 Move all terms containing n to the left, all other terms to the right. Add '4' to each side of the equation. -4 + 4 + -1n = 0 + 4 Combine like terms: -4 + 4 = 0 0 + -1n = 0 + 4 -1n = 0 + 4 Combine like terms: 0 + 4 = 4 -1n = 4 Divide each side by '-1'. n = -4 Simplifying n = -4Subproblem 2
Set the factor '(7 + -1n)' equal to zero and attempt to solve: Simplifying 7 + -1n = 0 Solving 7 + -1n = 0 Move all terms containing n to the left, all other terms to the right. Add '-7' to each side of the equation. 7 + -7 + -1n = 0 + -7 Combine like terms: 7 + -7 = 0 0 + -1n = 0 + -7 -1n = 0 + -7 Combine like terms: 0 + -7 = -7 -1n = -7 Divide each side by '-1'. n = 7 Simplifying n = 7Solution
n = {-4, 7}
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