Can someone answer a-c please!

Okay

Here an example for factoring the zero

A. X^2+x -20=0

(X+3) (x-4)=0

X+3=0 X-4=0

X=-3 Or x= 4

Here an an example for quadratic form

X-2=0

Formula for quadratic form is

Ax^2 +bx +c =0

Discriminant =b^2 -4ac

0^2 -4(1)(-2)=8

So 8 is not perfect square

Here we a solution

X= -b+-√b^2-4ac/2a

X= -0+_ √0^2-4(1)(-2)/2(1)

X=-0+_ √8/2

X= +_2 √2/2

Cancel 2

+_ √2

And last question which one you prefer so you can choice any

Hopefully this help you :)