Answers

2016-03-09T16:02:11+05:30
Let B= x then L= x+5..... Area = L×B...... But area is given to be 84 sq. ..... Therefore L×B= 84..........x×(x+5)=84........x^2+5x=84........ x^2+5x-84=0........... BY Quadratic Formula........D= b^2-4ac...........5^2-4*1*-84........=25+336= 361= √D= 19......... x = -b+-√D /2a= -5+-19/2............. Now x has two values... -5-19/2= -24/2= -12........ And x = -5+19/2= 14/2= 7....... Sides cannot be negative so x= 7. .............. Now, B = x= 7 cm..... And L= x+5= 7+5= 12 cm..
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2016-03-09T18:28:38+05:30
Let breadth = x cm
Length = (x +5) cm
Area = 84 sq cm
x(x+5)=84
x²+5x-84 = 0
(x+12)(x-7) = 0
x = 7 
So, breadth = 7 cm
length = 12 cm
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