Question

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(2a - 5b-7c)square

Answer 1

Answer:

hope this helpss

Step-by-step explanation:

mark it as brainlist plzz

Answer 2

Answer:

( 2a - 5b - 7c ) ^2

4a^2 + 25b^2 +49 c^2 - 20ab + 70bc - 28 ca ans

Step-by-step explanation:

(2a - 5b - 7c ) ^2

=>( a + b + c ) = a^2 + b^2 +c^2 +2ab + 2bc + 2ca

=>(2a)^2 - ( 5b) ^2 - (7c)^2 - 2• 2a • 5b + 2•5b •7c - 2•7c•2a

=>4a^2 + 25b^2 + 49b^2 - 20 ab + 70bc - 28ca .ans

hope its helpful !!!

and plzz mark me brainlist!!