What is a squared plus 11a plus 18?

Answer 1

Key: a^2 is the "computer" way of writing a squared.

a^2 + 11a + 18 = 0

What two numbers add up to 11 and multiply to be 18?

(a+2)*(a+9)=0

Set both of the parenthesis ( ) pairs to 0 and solve.

a+2=0

subtract two from both sides

a= -2

now the other parenthesis ( ) pair

a+9=0

subtract nine from both sides

a= -9

So the answer turns out to be that a = -2 and -9.

Answer 2

That depends on the value of "a". Once you know the value of "a", you can do the calculations and get a numeric value.