Solving quadratic equation by Factorisation

Solve a(a-9) = 0

• a = 0 or a= -9

• a = 0 or a = 9

• a = 1 or a = -9

• a = 1 or a = 9

Solve (k - 4)(k-9) = 0

• k = -4 or k = -9

• k = 4 or k = -9

• k = -4 or k = 9

• k = 4 or k = 9

Solve (-2t - 5)(8t - 5) = 0

• t = - 5/2 or t = 5/8

• t = 5/2 or t = 5/8

• t = - 5/2 or t = - 5/8

• t = 5/2 or t = - 5/8

Solve

 $3d^2-4d=0$  

• d = 0  or  $d\ =\ -1\frac{1}{3}$  

• d = 0  or  $d=\ 1\frac{\text{1}}{3}$  

•  $d\ =\ 1\frac{1}{3}\ \ \ \ or\ \ \ \ \ d=-1\ \frac{1}{3}$   

• d = 1  or  $d\ =\ -1\frac{1}{3}$  

Solve

 $k^2+12k+36\ =0$  

•  k = 6 or k = -6

• k = 0  or k = -6

• k = -6

• k = 6

Solve

 $4r^2-100=0$  

• r = 0    or      r = -5

• r = -5   or     r = 5

• r = 0   or     r = 5

• none of the option

Solve

 $3y^2+7y-6=0$  

•  $y=\frac{2}{3}\ \ \ \ or\ \ \ \ y=-3$  

•  $y\ =\ -\frac{2}{3}\ \ \ \ or\ \ \ y=3$  

• y = 2   or  y = 3

•  $y=\frac{2}{3}\ \ \ \ or\ \ \ \ \ y\ =\ 3$  

Solve

 $2z^2-3z-14=0$  

•  $z\ =\ 3\frac{1}{2}\ \ \ \ or\ \ \ \ \ \ z=-2$  

•  $z\ =\ 3\frac{1}{2}\ \ \ \ or\ \ \ \ \ \ z=2$  

•  $z\ =-\ 3\frac{1}{2}\ \ \ \ or\ \ \ \ \ \ z=-2$  

•  $z\ =-\ 3\frac{1}{2}\ \ \ \ or\ \ \ \ \ \ z=2$  

Solve

 $15\ =\ 8h^2-2h$  

•  $h=-1\frac{1}{4}\ \ \ \ \ or\ \ \ \ \ h=1\frac{1}{2}$  

•  $h=-1\frac{1}{4}\ \ \ \ \ or\ \ \ \ \ h=-1\frac{1}{2}$  

•  $h=1\frac{1}{4}\ \ \ \ \ or\ \ \ \ \ h=1\frac{1}{2}$  

•  $h=1\frac{1}{4}\ \ \ \ \ or\ \ \ \ \ h=-1\frac{1}{2}$  

Solve

 $3r^2-5\left(r+1\right)=7r+58$  

• r = -3   or   r =  -7

• r = -3   or   r =  7

• r = 3   or   r =  -7

• r = 3   or   r =  7