Solving Quadratic Equations - Factorising

Solve the following equation  $a\left(a-5\right)=0$  

•  $a=5$  

•  $a=0,\ a=-5$  

•  $a=5,\ a=0$  

•  $a=\frac{1}{5},\ a=0$  

• No Solution

Solve the equation  $x^2-7x=0$  

•  $x=-7,\ x=0$  

•  $x=0,\ x=7$  

•  $x=\frac{7}{2},\ x=-7$  

•  $x=-6$  

• No Solution

Solve the equation  $x^2-9x+20=0$  

•  $x=-4,\ x=5$  

•  $x=4,\ x=-5$  

•  $x=-4,\ x=-5$  

•  $x=4,\ x=5$  

• No Solution

Solve the following  $b^2=8b$  

•  $b=8$  

•  $b=0,\ b=8$  

•  $b=0,\ b=-8$  

•  $b=7,\ b=0$  

• No Solution

Solve the following  $2x^2+7x+2=-1$  

•  $x=7,\ x=2$  

•  $x=-7,\ x=4$  

•  $x=\frac{1}{2},\ x=-3$  

•  $x=-\frac{1}{2},\ x=-3$  

• No Solution