If your given the x intercepts and the vertex, how do you put it into x intercept form

Find the zero function by factoring (try to show work) h(x)=-x^2-6x-9

Dexter read 11 science fiction books and 5 history books. lena read 9 science fiction books and 4 history books. compare the students’ ratios of science fiction books to history books. 1. determine the ratios’ form:    science fiction books to history books 2. write the ratios as fractions:    dexter: 115; lena: 94 3. rewrite with a common denominator. 4. compare. 5. answer the question. determine which shows the correct comparison of the ratios for this problem.

Complete the solution of the equation. find the value of y when x equals to 28 x+3y=28