A baker needs 8 1/2cups of flour for a sheet cake recipe. He has 4 2/3cups of flour in a canister and buys 5 1/4 cup
more.
How much flour does he have left after he makes the sheet cake?

A → opens down, B → maximum, C → x = 0, (0, 5) and 5

For a parabola of the form y = ax² + c

• If a > 0  then opens up and is a minimum

• I f a < 0 then opens down and is a maximum

the y- intercept = c and the vertex = (0, c)

The axis of symmetry is the y- axis, that is x = 0

f(x) = -5x² + 5 is in this form with a = - 5 < 0 and c = 5

Thus the parabola opens down and is a maximum

The axis of symmetry is x = 0, vertex = (0, 5) and y-intercept = 5