Question

Factor Completely. If the equation is prime, state this.
10r^2-29r+10

Answer 1

(r-2.5)(r-0.4)

Answer 2

How do you work it out though
That is my main problem

Answer 3

if you use the quadratic formula you can find out what r is. so for example if r=1 or 2 you know that (r-1)(r-2) will give you the answer right because:
(r-1)(r-2) = 0
r-1 = 0 or r-2 = 0
r = 1 or r = 2
so you use the same logic for this question and you can use the quadratic formula to find out that r = 5/2 or r = 2/5

Answer 4

do you understand..?

Answer 5

not really

Answer 6

sorry i'm really not sure how to explain then ><"