Lesson 27 Solving Quadratics

Lesson 27 Solving Quadratics

Open Ended

Multiple Choice

Solve the quadratic equation,

 $x^2-15=0$  

•  $\sqrt{15}$  only

•  $-\sqrt{15}$  only

•  $\sqrt{15},\ -\sqrt{15}$  

• No real solutions

Multiple Choice

Solve the quadratic equation,

 $7x^2-2x-5=0$  

•  $\frac{5}{7},\ 1$  

•  $-\frac{5}{7},\ 1$  

•  $\frac{5}{7\ },\ -1$  

•  $-\frac{5}{7},\ -1$  

Multiple Choice

What are the solutions to the equation ?

 $x^2-4x=-3$  

•  $\frac{4\pm\sqrt{16-4\cdot0\cdot-3}}{2\cdot0}$  

•  $\frac{4\pm\sqrt{16-4\cdot1\cdot-3}}{2\cdot1}$  

•  $\frac{4\pm\sqrt{16-4\cdot1\cdot3}}{2\cdot1}$  

•  $\frac{-4\pm\sqrt{16-4\cdot1\cdot3}}{2\cdot1}$  

Multiple Choice

Which expression is equivalent to

 $\sqrt{-23}$  ?

• -23i

• 23i

•  $-\sqrt{23}i$  

•  $\sqrt{23}i$