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## Sagot :

[tex](4k+5)(k+1)=0\iff4k+5=0\ or\ k+1=0\\\\4k=-5\ or\ k=-1\\\\\boxed{k=-\frac{5}{4}\ or\ k=-1}[/tex]

Before you rush off and start trying to do complicated things with that equation,

put your pencil down, fold your hands in your lap, and sit and look at it for a while.

Keep looking at it until a little voice yells out "Hey ! That's a true statement if

either (4k + 5) is zero or (k+1) is zero. THEN go to work on it.

**(4k + 5 = 0)**

4k = -5

__k = -5/4__**(k + 1 = 0)**

__k = -1__And there are the two solutions to that equation.