1.

5x+2y = 0(b) If a + b + c = 2, ab + bc + ca = -1 and abc = -2, find the value of a +b+2.​

Answer»

=  \: a + b + c \\  =  \: a \:  +  \: b \:  + (a \:  +  \: b \:  +  \: c) \\  =  \: a \:  + b \:  +  \: a \:  +  \: b \:  +  \: c \\  =  \: 2a \:  + 2b \:  + c



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