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.4

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.4

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

Hint: Remember to simplify your answer!

•  $\left\{\sqrt{12}\right\}$   

•  $\left\{144\right\}$  

•  $\left\{\pm\ 2\sqrt{3}\right\}$  

•  $\left\{6\right\}$  

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

•  $\left\{20\right\}$  

•  $\left\{8,\ 20\right\}$  

•  $\left\{-8,\ -20\right\}$  

•  $\left\{-22\right\}$  

Who wrote Romeo and Juliet?

• Ms. Lennard

• Ms. Nesbitt

• Ms. Postema

• Mr. Welser

• Mr. Shakespeare

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

•  $\left\{\pm\sqrt{6}-1\right\}$  

•  $\left\{1\pm\sqrt{6}\right\}$  

•  $\left\{37\right\}$  

•  $\left\{1\pm\sqrt{3}\right\}$   

Solve by taking square roots.
 $\left(2x+1\right)^2=4$  

•  $\left\{\pm\ 2\right\}$  

•  $\left\{\pm\ \frac{1}{2}\right\}$  

•  $\left\{-\frac{3}{2},\ \frac{1}{2}\right\}$  

•  $\left\{-\frac{1}{2},\ \frac{3}{2}\right\}$  

Solve by taking square roots.
 $x^2-64=0$  

•  $\left\{\pm\ 32\right\}$  

•  $\left\{\pm\ 16\right\}$  

•  $\left\{\pm\ 8\right\}$  

•  $\left\{\pm\ 4\right\}$  

Tags

CCSS.HSA.REI.B.4

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.A.2

CCSS.HSA.REI.B.4

How many legs does a spider have?

• 2

• 4

• 6

• 8