Question

Prove that x³-2x²-7x+5=3 when x=1/(2-√3)

Answer 1

1/(2-√3)= 2+√3/1 = (2+√3)^3-( 2+√3)^2 - 7(2+√3) + 5=( 26+15√3) - (14 - 8√3)-(14 - 7√3) + 5 = 3 HENCE , PROVED.