hope it helps ☺
Step-by-step explanation:
1. x²-9x+8=0
x²-x-8x+8=0
x(x-1)-8(x-1)=0
(x-1)(x-8)=0
x-1= 0 x-8=0 final
2. x²+14x+40=0
x(x+10)+4(x+10)=0
(x+10)(x+4)=0
x+10=0 x+4=0
x=-10 x=-4 final
3. 2x²+13x=7
2x²+13x-7=0
2x²+14x-x-7=0
2x(x+7)-(x+7)=0
(x+7)(2x-1)=0
x+7=0 2x-1=0
x= -7 x=1/2 final answer
4. (3x-1)(x+2)=0
3x-1=0 x+2=0
x= -2 x=1/3 final
5. x²-x-20=0
x²+4x-5x-20=0
x(x+4)-5(x+4)=0
(x+4)(x-5)=0
x+4=0 x-5=0
x= -4 x=5 final
