Question

(3a-5b-7c)²expand the following with suitable identity
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Answer 1

answer

\((3a -5b-7c)^2\)

Using,\( (a + b + c)^2 = a^2 + b^2 + c^2 + 2ab +2bc + 2ca\)

\(=(3a)^2+(-5b)^2+(-7c)^2+2\times 3a\times (-5b)+2\times (-5b)\times (-7c)+2\times (-7c)\times (3a)\)

\(=9a^2+25b^2 + 49c^2-30ab + 70bc-42ca\)

Answer 2

Step-by-step explanation:

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