Question

If a, b, c, d are in proportion, prove that:
(i) (5a + 7b) (2c - 3d) = (5c + 7d) (2a - 3b)
Answer fst and i will mark you as the brainest​

Answer 1

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:

Scared or what

Have u proposed anyone else like this