nihan5363
nihan5363
09-06-2021
Mathematics
contestada
x^(2)+x-20
splitting the middle term
Respuesta :
colinspurdle
colinspurdle
09-06-2021
Are you trying to factorise this?
Here is a way you may not have been taught....
(x + a)(x + b) = x^2 + (a + b)x + ab
So you need to find two factors of -20 that add up to +1
-4 x 5 = -20 and -4 + 5 = 1. Perfect
x^2 + x - 20 = (x - 4)(x + 5)
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