Can someone help me with these math Problems. I do not get them.?

Question

1. What is the x intercept of Y=x^2+5x+2

2. Is the following trinomial a perfect square and Why?
x^2+18x+81

Thank for all of your help.

Answer 1

Question 1
x ² + 5 x + 2 = 0
x = [- 5 ± √(25 - 8)] / 2
x = [- 5 ± √(18)] / 2
IF the equation was:-
x² + 3x + 2 = 0
(x + 2) (x + 1) = 0
x = - 1 , x = - 2 (which looks more plausible?)

Question 2
(x² + 18 x + 81) = (x + 9) (x + 9) = (x + 9)²
A perfect square.

Answer 2

the x intercept is when Y = 0

Answer 3

and it is a perfect square because it = (x +9)^2