$\displaystyle \sqrt{5-x}+1=x+2$
To This
$\displaystyle x^2+3x-4=0$
Then solved. But different solution.
First I set the radical by itself then squared it. Then solved it. But the solution is different from what I got. Any help please. Thanks
Note that if you square both sides of an equation (or, more generally, multiply both sides by the same thing), you may introduce values that satisfy the new equation but not the original equation. For example, x= 3 has only the obvious solution "3" but $\displaystyle x^2= 9$ has both 3 and -3 as solutions.
The "answer" is to check any solutions you get in the original equation. $\displaystyle x^2+ 3x- 4= 0$ has two roots but only one of them satisfies $\displaystyle \sqrt{5- x}+ 1= x+ 2$.