How do you find the y-intercept of a line given two ordered pairs?

Marcus needs to rewrite f(x) = x2 + 6x + 4 in vertex form.

Which of the following is another way to express the difference between -5 and 8?

Draw a graph y=f(x) that matches the following characteristics. increasing on: -8< x< -4 and-1< x< 5. decreasing on : -4< x< -1. f(-8)=-5 and zeros at x=-6,-2,and 3. absolute maximum of 7 and absolute minimum of -5.