Question

which expression is factor of 9r^2-4r+1

Answer 1

a=9

b=-4

c=1

b^2-4ac

by using this formula

solve it

Answer 2

Answer:

Heya

we could answer this either by checking each listed expression to see whether it's a factor of 9r^2-4r+1 OR..

We could take the coefficients of 9r^2-4r+1 ,, determine the quantity

b^2-4ac (called the 'discriminant') and draw a conclusion based upon whether the discriminant is -,+ or 0 ...

let's use the second approach

here a = 9, b= -4, c= 1

Then discriminant is b^2 2 -4ac or -4^2

-4(9)(1) ,, or 16-36