posted by jasmine20 .
How can i solve for this would it best to factor or use the quadratic formula.
How about for this problem as well:
solve : x^2+7x-1 = 0
in the first, can you think of two multipliers of -8 that have a sum of 2??
how about 4 and -2
so it factors!
in the second, are there any factors of -1 that have a sum of 7????
not very likely, so use the formula