Question

Garrrrryy

no need to show work
two questions
thankks

Answer 1

1.
`x^2-x-72=0`

`\Delta=(-1)^2-4*1*(-72)=1+288=289`

`√(\Delta)=17`

`x_1=(1-17)/(2)=-8`

`x_2=(1+17)/(2)=9`

2.
`f(x)=x^2+12x+20`

`\Delta=144-80=64`

`√(\Delta)=8`

`x_1=(-12-8)/(2)=-10`

`x_2=(-12+8)/(2)=-2`