Question

its not letting me type into the post box, its a^2-11a+18=0

Answer 1

ok to do these you have to find two numbers that add to -11 and multiply to 18

Answer 2

a^2-9a-2a+18

Answer 3

9 -2

Answer 4

Now work out from here

Answer 5

in this case it would be -2 and -9

Answer 6

so put it in parenthesis (x-9)(x-2)=0

Answer 7

Yeap a=9 and 2

Answer 8

then set them against zero
x-9=0
x=9

x-2=0
x=2

x={2,9}

Answer 9

right it was a
a={2,9}