Question

Can someone help with this question ??
fully factorise x^2+ 9x +18

Answer 1

This is of the form ax^2+bx+c, you must find two values, j and k, that satisfy two conditions:

jk=ac=18 and j+k=b=9, so j and k must be 3 and 6, and the factors then must be:

(x+3)(x+6)