Question

if x=1/√5-2 then find x³-3²-5x+3 ​

Answer 1

Answer:

hope this helps u

Step-by-step explanation:

x² = (√5 + 2)²

=> (√5)² + 2 × √5 × 2 + (2)²

=> 5 + 4√5 + 4

=> 9 + 4√5

Now,

x³ - 3x² - 5x + 3

=> (√5 + 2)(9 + 4√5) - 3(9+4√5) - 5(√5 + 2) +3

=> 9√5 + 20 + 18 + 8√5 - 27 - 12√5 - 5√5 - 10 + 3

Therefore the answer is 4

Thanks for the question!