plzz do these math. I can't solve this.
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Step-by-step explanation:
perimeter of rectangle = 2(L+ B)
180. = 2(L+B)
180/2. = L+B
90. = L+B
L = 90 - B ....1
Area of rectangle = L*B
2000. = L*B......2
using equation (1) inequation (2)
L*B = 2000
(90-B) B = 2000
90B - B^2 = 2000
i.e. B^2 - 90 B + 2000 = 0
by factorisation
B^2-50B-40B + 2000 = 0
(B^2 -50B) (-40B + 2000) = 0
B(B - 50) -40(B -50) = 0
(B-40) (B-50) = 0
B-40 = 0 or B-50 = 0
B= 40 or B= 50
from equation 1
L = 50 or L = 40
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