Question

how to you factor 2x^2+5x-7?

Answer 1

that's alot of primes. what ideas do you have?

Answer 2

2x(x + 2.5) -7

Answer 3

i have no idea

Answer 4

ok, so, first thing is we want to get rid of that nasty 2

Answer 5

ok

Answer 6

so let's divide it out

Answer 7

can you do that?

Answer 8

\[=x(2x+7) - (2x+7)\]
=(x-1)(2x+7)

Answer 9

how did you get that?

Answer 10

i was just going to complete the square

Answer 11

but popitree's is nicer

Answer 12

the form is ax^2+bx+c; so we need some combination so that we can take common out
here a.c = 2*-7; = -14;
now as the sign is negative we need two numbers when subtracted will result in b that is 5
here 7-2=5

so basically it is 2x^2+x(7-2)-7
then take the commons