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Mathematics

OpenStudy (anonymous):

solve for x and tell what method you used: 2x^2-5x-42=0

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OpenStudy (anonymous):

use quadratic formula

OpenStudy (anonymous):

does it factor?

OpenStudy (anonymous):

\[-b \pm (\sqrt{b ^{2} -4ac})/2a \]

OpenStudy (anonymous):

where a=2 b=-5 c=-42

jimthompson5910 (jim_thompson5910):

Multiply 2 and -42 to get -84 Now you need to find two numbers that multiply to -84 and add to -5: These two numbers are -12 and 7 Since such two numbers exist, this can be factored.

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OpenStudy (anonymous):

thanks bro just looked up how to use the tic tac toe method of factoring lol

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