Question

factor completely.
r^2-22r+121

Answer 1

how did you get that

Answer 2

HI!!

Answer 3

it is actually \[r^2-22x+121=(r-11)^2\]

Answer 4

you get it because \(121=11^2\) and \(-22=-2\times 11\)

Answer 5

in general \[(a+b)^2=a^2+2ab+b^2\] so for example \[x^2-10x+25=(x-5)^2\]

Answer 6

You need to find out what two numbers add to equal -22 and multiply to equal 121. In this case it's -11 and -11. After finding the two numbers, you write it like this: (r-11)(r-11). You can also use the quadratic formula to find the solution.