Which of the following is a factor when factoring the Trinomial? x^2 - x + 20

A x−4

B x−5

C x−10

D x+2

A) x-4 IF you meant x^2 - x - 20

Step-by-step explanation:

You cannot factor x^2 - x + 20 with rational numbers. Therefore, none of the answer choices are correct. If, however, you mean x^2-x-20, then that can be factored into (x-5)(x+4) which would mean A is correct.

we have three similar triangles, because each has a right angle and shares an angle.   let's write the angles in order: opposite to short leg, long leg, hypotenuse.

cab similar to bad similar to cbd

or as ratios,

ca: ab: cb = ba: ad: bd = cb: bd: cd

we also know

ac = ad + cd

(ad+cd): ab: cb = ba: ad: bd = cb: bd: cd

(ad+cd)/cb=cb/cd

we have cb=6, ad=5 and seek x=cd.

we reject the negative root and conclude x=4

answer: 4