Question

if x=1/2√3 prove that x cube -2x square -7x+5=3

Answer 1

Hi see the PIC for half solution ..let's move on
→x³-2x²-7x+5
=>26+15√3-2(7+4√3)-7(2+√3)+5
=>26+15√3-14-8√3-14-7√3+5
=>31-28+15√3-8√3-7√3
=>3
@:-)