Question

PLEASE HELP ME FAST!!! If his a solution to the equation? (X-2)(x+5)=18

A)x=-10
B)x=-7
C)x=-4
D)x=-2

Answer 1

There are two ways to do this, solve the equation or try all the answers. I'll solve.


`18=(x-2)(x+5)=x^2+3x-10`


`0=x^2+3x-28`


`0=(x+7)(x-4)`


`x=-7\quad \textrm{or} \quad x=4`

Choice B,
`x=-7`

The other root was not among the choices.