Question

Find the area of a rectangular plot whose length is (2a2 + 5b2) Km and breadth is ( a2 – 3b2)Km. Also find its value at a=1 and b=(-1)

Answer 1

Answer:

261cm2

Step-by-step explanation:

given L = 2a2 + 5b2

given B = a2 - 3b2

area = lxb

= 2a2 + 5b2 x a2 - 3b2

putting value a = 1 and b = -1

2(1)2 + 5(-1)2 x (1)2 - 3(-1)2

4 + 25 x 1 + 9

29 x 9

=261

hope it helps.