Question

Which direction does the graph of f(x) = −18 + x2 − 3x open?

Answer 1

Please write this equation as    f(x) = −18 + x^2 − 3x       

Rewrite it in descending order by powers of x:  f(x) = x^2 - 3x - 18

Since the coefficient of the x^2 term is +, the graph opens UP.