Question

The length of rectangle is 20 cm more than its breadth. if the perimeter is 84 cm find the perimeters of rectangle 2

Answer 1

Answer:

15 is the correct answer

Answer 2

Answer:

x=3.56

Step-by-step explanation:

let

b = x

l=(20+x) as per the question perimeter=84

perimeter of rectangle= lengthxbredth

(20+x) x (x) = 84

solveing it we will get

20x + x²- 84 =0

re arranging the terms will give

x² + 20x- 84 =0

bt the quadratic formula :minus b plus or minus root b square minus four ac by 2a

we get x= 3.56 and an another negitive root where it is ignored i.e -47.12 as it is a -ve value breadth can't be in negitive

the breadth =3.56 m

length= 23.56m