Quadratic Functions Review

Quadratic Functions Review

Quadratic Functions

• Quadratic functions always have an exponent of 2 on x, and they make a shape called a parabola when graphed.

• To find the vertex, use the formula  $\frac{-b}{2a}$  to get the x-value. Then plug that x back into the original function to find the y-value

• The leading coefficient (a) tells you whether the parabola opens UP or DOWN.

Multiple Choice

Which of these is a quadratic function?

• f(x) = 2x + 4
• f(x) = -2x + 4
• f(x) = 3x²
• q(x) = 3x³ + 2x² - 4x + 9

Multiple Choice

What is the vertex?

• (5,2)
• (2,5)
• (-2,5)
• (-5,2)

Multiple Choice

Does the equation open up or down? 
Y = -3x² +7x - 2

• up
• down
• both 
• neither

Multiple Choice

Find the vertex of 
f(x) = -x² - 4x + 12

• (-2, 16)
• (2, 0)
• (2, 4)
• (-2, 4)

Multiple Choice

Find the Vertex:
y = x² + 6x + 2

• (-3,-7)
• (1,6)
• (6,2)
• No Real Solution