Question

the length of a rectangle is 5 cm greater that its breadth if the length is doubled and breadth is tripled then the area of new rectangle is increased by the area of original rectangle 70 cm square find the length and breadth of the rectangle also check the solution​

Answer 1

Answer:

Step-by-step explanation:

l = 5 + b

now, l becomes 2l and b becomes 3b

and are is increased by 70.

old area = l x b= 5+b(b)= 5b + b^2

new area = 2l x 3b

  5b + b^2 + 70 = 2(5 + b) x b

  b^2 + 5b + 70 = 10b + 2b^2

0 = b^2 - 5b -70

now find its root and that will be its answer.

Thank You