solving quadratic equations by taking square roots

Solve by taking square roots.
 $x^2=81$  

•  $\left\{40.5\right\}$  

•  $\left\{9\right\}$  

•  $\left\{\pm\ 9\right\}$  

•  $\left\{0,\ 9\right\}$  

Tags

CCSS.HSA-REI.B.4B

Solve by taking square roots.
 $x^2-225=0$  

Hint: Isolate $x^2.$   

•  $\left\{\pm\ 14\right\}$  

•  $\left\{15\right\}$  

•  $\left\{\pm\ 15\right\}$  

•  $\left\{112.5\right\}$  

Tags

CCSS.HSA-REI.B.4B

Solve by taking square roots.
 $x^2=12$  

Hint: Remember to simplify your answer!

•  $\left\{\sqrt{12}\right\}$   

•  $\left\{144\right\}$  

•  $\left\{\pm\ 2\sqrt{3}\right\}$  

•  $\left\{6\right\}$  

Tags

CCSS.HSA-REI.B.4B

Solve by taking square roots.
 $\left(x-14\right)^2=36$  

•  $\left\{20\right\}$  

•  $\left\{8,\ 20\right\}$  

•  $\left\{-8,\ -20\right\}$  

•  $\left\{-22\right\}$  

Tags

CCSS.HSA-REI.B.4B

Find the x-intercept(s) by taking square roots.
 $\left(x-1\right)^2=6$  

•  $\left\{\pm\sqrt{6}-1\right\}$  

•  $\left\{1\pm\sqrt{6}\right\}$  

•  $\left\{37\right\}$  

•  $\left\{1\pm\sqrt{3}\right\}$   

Tags

CCSS.HSA-REI.B.4B

Find the zero(s) by taking square roots.
 $x^2-7=0$  

•  $\left\{7\right\}$  

•  $\left\{-7\right\}$  

•  $\left\{\pm\ 7\right\}$  

•  $\left\{\pm\sqrt{7}\right\}$  

Tags

CCSS.HSA-REI.B.4B

What are the x- intercepts?

• x= 0 and x= -4
• x= 0 and x= 4
• y= 0
• x= 2

Tags

CCSS.HSF-IF.C.7A

What is the vertex?

• (2, 4)
• (3, -1)
• (0, 8)
• (4, 2)

Tags

CCSS.HSA.CED.A.2

CCSS.HSA.REI.D.10

CCSS.HSF.IF.B.4

CCSS.HSF.IF.C.7

What is the green dot on the parabola called?

• maximum
• minumum
• roots
• zeros

Tags

CCSS.HSF-IF.C.7A

If each mark on the x-axis represents one second, when did the object reach its maximum height?

• 2.5 seconds

• 1 seconds

• 5.5 seconds

• 3.5 seconds