exam Maths Puzzle Numerical Ability

1) ...HIS BOYHOOD LASTED 1/6 TH HIS LIFE; HE MARRIED AFTER 1/7 TH MORE; HIS BEARD GREW AFTER 1/12 MORE, AND HIS SON WAS BORN 5 YEARS LATER; THE SON LIVED TO HALF HIS FATHER'S AGE,

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exam Other Question

Find the values of each of the following plynomials of the given values of the variable:
-x^2-5x-6, x = -3 and x = -2

I am not getting this problem and a bit confused on how to solve this,and need some help. Thanks.
I am using the intercept method and I do not know the beginning this is the problem and this is what I got
2x+3y=6
3x=6-2x subtract
6-2 add from there I am lost please help me get the concept Thank you