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mathstudent55 Group TitleBest ResponseYou've already chosen the best response.0
First, add 21 to both sides. Once you have all three terms on left side equaling zero on right side, try to factor the left side. Then set each factor equal to zero and solve both equations. If you can't factor it, the use the quadratic formula.
 one year ago

JUICEDECAFE Group TitleBest ResponseYou've already chosen the best response.1
Simplifying x2 + 10x = 21 Reorder the terms: 10x + x2 = 21 Solving 10x + x2 = 21 Solving for variable 'x'. Reorder the terms: 21 + 10x + x2 = 21 + 21 Combine like terms: 21 + 21 = 0 21 + 10x + x2 = 0 Factor a trinomial. (3 + 1x)(7 + 1x) = 0 Subproblem 1Set the factor '(3 + 1x)' equal to zero and attempt to solve: Simplifying 3 + 1x = 0 Solving 3 + 1x = 0 Move all terms containing x to the left, all other terms to the right. Add '3' to each side of the equation. 3 + 3 + 1x = 0 + 3 Combine like terms: 3 + 3 = 0 0 + 1x = 0 + 3 1x = 0 + 3 Combine like terms: 0 + 3 = 3 1x = 3 Divide each side by '1'. x = 3 Simplifying x = 3 Subproblem 2Set the factor '(7 + 1x)' equal to zero and attempt to solve: Simplifying 7 + 1x = 0 Solving 7 + 1x = 0 Move all terms containing x to the left, all other terms to the right. Add '7' to each side of the equation. 7 + 7 + 1x = 0 + 7 Combine like terms: 7 + 7 = 0 0 + 1x = 0 + 7 1x = 0 + 7 Combine like terms: 0 + 7 = 7 1x = 7 Divide each side by '1'. x = 7 Simplifying x = 7Solutionx = {3, 7}
 one year ago

jennaaanicoleee Group TitleBest ResponseYou've already chosen the best response.0
oh wow thank you!
 one year ago

mathstudent55 Group TitleBest ResponseYou've already chosen the best response.0
x^2  10x = 21 Add 21 to both sides: x^2  10x + 21 = 0 Factor left side: (x  7)(x  3) = 0 Set each factor equal to zero and solve: x  7 = 0 or x  3 = 0 x = 7 or x = 3
 one year ago
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