Question

The value of (2a +36-5c+70)2-(2a-36+5c-7d)2 is
A) 4a(6b-10c+14d)
B) 4a(6b+10c-14d)
C) 4a(6b+10c+14d)
D) none​

Answer 1

Answer:

the correct answer is there

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Step-by-step 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

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