Question

Show that 1 is a root of the equation 2x2-x-1=0​

Answer 1

Answer:

given p(x)=2x²-x-1=0​

to show 1 is a root of this polynomial p(1)=0

p(1)=2×1²-1-1

      =2-1-1

     =2-2

     =0

so we get p(1)=0

so we proved that 1 is a root of this equation.