Question

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

Answer 1

use quadratic formula

Answer 2

does it factor?

Answer 3

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

Answer 4

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

Answer 5

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.

Answer 6

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