1.

Show that x = 2 is a root of 2x3 + x2 - 7x - 6.

Answer»

p(x) = 2x3 + x2 - 7x - 6 then, 

 p(2) = 2(2)3 + (2)2 7(2) - 6 = 16 + 4 - 14 - 6 = 0 

 Hence x = 2 is a root of p(x).



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