+9479 Hey! This is the same equation that you get from the last question.
You can solve it by factoring like this....
-2x2 + 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 .
-2x2 - 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
+9479 Hey! This is the same equation that you get from the last question.
You can solve it by factoring like this....
-2x2 + 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 .
-2x2 - 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
+895 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.
