Quadratic Equations, Vertex

Convert the equation from vertex form (shown) to standard form:

• y = 9x² - 15x + 21

• y = -3x² - 75x - 4

• y = 9x² + 90x + 221

• y = -3x² - 30x - 79

Which of the following statements are TRUE? Select all that apply.

• The "a" value is positive.

• The y-intercept is positive.

• It has two zeros.

• The axis of symmetry is x = 1.

• The vertex is at (0, 5).

Tags

CCSS.HSF-IF.C.7A

• (-3, 1); opens up

• (-3, 1); opens down

• (3, 1); opens up

• (3, 1): opens down

• (-5, -2); opens up

• (-5, -2); opens down

• (5, -2); opens up

• (5, -2): opens down

• (-1, 6); opens up

• (-1, -6); opens down

• (-1, -6); opens up

• (1, -6): opens down

Tags

CCSS.HSF-IF.C.7A

• (-7, 2); opens up

• (-7, -2); opens down

• (7, 2); opens up

• (7, -2): opens down

Tags

CCSS.HSF-IF.C.7A

• (-3, -5); opens up

• (-8, -5); opens down

• (-8, -5); opens up

• (3, -5): opens down

• (4, 1); opens up

• (4, 1); opens down

• (-1, 4); opens up

• (-1, 4): opens down