Answer:
7 m
Step-by-step explanation:
If the width of rectangle is a
the length of a rectangle is a+5
the rectangle area formular is the width × the length
a(a+5) = 84
a^2 + 5a = 84
a^2 + 5a - 84 = 0
(a-7)(a+12) = 0
a = 7, -12 but we cut the -12 out due to the width must show the positive values.
a shows the only one answer 7
the width = 7 m
