Linear and Quadratics

What is the vertex of y=x²+4x+3?

• (2,1)

• (-2,1)

• (0,0)

• (-2,-1)

Find the best fitting Quadratic model for the data

• -.26x^2-17.3x+222.8

• -.26x²+22.59x+23.02

• 2.6x²+22.9x+20.03

• 2.6x²+2.3x+23.02

Find the best fitting quadratic model for the data given.

• 2x² + 13x + 504.3

• 12x² + 13x + 504.3

• .12x² + 1.3x + 504.3

Standard form of a quadratic equation

• y=x²

• y=ax²+bx+c

• y=mx+b

• y=x

Factor: x² + 2x – 3

• (x - 2)(x + 1)

• (x + 1)(x - 3)

• (x + 2)(x - 1)

• (x - 1)(x + 3)

Write y = x² + 4x - 1 in vertex form.

• y = (x - 2)² + 5

• y = (x + 2)² - 5

• y = (x + 2)² - 1

• y = (x +2)² + 3

Choose the equation that is graphed in the picture.

• y = 2x - 2

• y = -2x - 2

• y = -2x + 2

• y = 1/2x - 2

What is the slope of this line?

*Hint: think rise over run*

• 3/4

• -3/4

• 4

• 3

Where is the y-intercept?

• 3/4

• -3/4

• 4

• 3

Determine the slope and y-intercept.         y = 3/2x + 3

• slope: 5   y-intercept:  (0,3) 

• slope: 3/2   y-intercept:  (0,3) 

• slope:  4  y-intercept:  (0,3/2)

• slope: 1/5   y-intercept:  (0,5)