Question

The width of a rectangle is the length minus 4 units. The area of the rectangle is 21

Answer 1

Answer:

3 is the answer...Only stating facs so there you go, hope It helped :)

Step-by-step explanation:

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Answer 2

Answer:

$Length=7 units\\Width=3 units$

Step-by-step explanation:

let the Length= L

$Width(W)=L-4\\Area=21Units^2$

      Area of a rectangle= Length* Width

                                 21=L*(L-4)

                                 $L^2-4L=21\\\\L^2-4L-21=0\\\\L^2+3L-7L-21=0\\\\L(L+3)-7(L+3)=0\\\\(L+3)(L-7)=0\\\\L=-3 \\OR\\ L=7$

The length cannot be negative so, Length = 7 units

Width=Length-4

Width=7-4= 3 units

                               $Length=7 units\\Width=3 units$