#1**+3 **

Hey! This is the same equation that you get from the last question.

You can solve it by factoring like this....

-2x^{2} + x + 21 = 0

Multiply the -2 and 21 to get -42 .

Now split the middle term with two numbers that add to 1 and multiply to -42 .

-2x^{2} - 6x + 7x + 21 = 0

Factor a -2x out of the first two terms and a 7 out of the last two terms.

-2x(x + 3) + 7(x + 3) = 0

Factor a (x + 3) out of both remaining terms.

(x + 3)(-2x + 7) = 0

hectictar
Sep 13, 2017

#1**+3 **

Best Answer

Hey! This is the same equation that you get from the last question.

You can solve it by factoring like this....

-2x^{2} + x + 21 = 0

Multiply the -2 and 21 to get -42 .

Now split the middle term with two numbers that add to 1 and multiply to -42 .

-2x^{2} - 6x + 7x + 21 = 0

Factor a -2x out of the first two terms and a 7 out of the last two terms.

-2x(x + 3) + 7(x + 3) = 0

Factor a (x + 3) out of both remaining terms.

(x + 3)(-2x + 7) = 0

hectictar
Sep 13, 2017

#2**+1 **

The other guy's answer really confused me because he didn't know how to use Latex, so I worked most of it out as best I could then asked this.

AdamTaurus
Sep 13, 2017