The expression √25+2(√35-√65-√91)

The expression √25+2(√35-√65-√91)

The expression   

is equal to

(a)   –   – 

(b)   –   + 

(c)   –   – 

(d) (  +   –             )

Sol:

As we know

(a + b + c)² = a² + b² + c² + 2(ab + bc + ca)

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