Question

If a/b = c/d then show that 2a - 5c/2b - 5d = 3a + c/3b + d

Please solve the above problem
I'll give 20 thanks for right answer​

Answer 1

Explanation:

ANSWER

a,b,c,d are in proportion

⇒ad=bc

Now

LHS:

(5a+7b)(2c−3d)

=10ac−15ad+14bc−21bd

=10ac−21bd−ad

RHS

(5c+7d)(2a−3b)

=10ac−15bc+14ad−21bd

=10ac−21bd−ad

⇒LHS=RHS

Answer 2

Answer:

If a/b = c/d then show that 2a - 5c/2b - 5d = 3a + c/3b + d