Respuesta :
Answer:
[tex]Length=7 units\\Width=3 units[/tex]
Step-by-step explanation:
let the Length= L
[tex]Width(W)=L-4\\Area=21Units^2[/tex]
Area of a rectangle= Length* Width
21=L*(L-4)
[tex]L^2-4L=21\\\\L^2-4L-21=0\\\\L^2+3L-7L-21=0\\\\L(L+3)-7(L+3)=0\\\\(L+3)(L-7)=0\\\\L=-3 \\OR\\ L=7\\\\[/tex]
The length cannot be negative so, Length = 7 units
Width=Length-4
Width=7-4= 3 units
[tex]Length=7 units\\Width=3 units[/tex]
Answer:
3 is the answer...Only stating facs so there you go, hope It helped :)
Step-by-step explanation:
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