Question

X=3+√5 value of (2x3-9x2-10x+13)
Answer..
A.12√5
B.0
C.1

Answer 1

Answer:

(C) 1

Step-by-step explanation:

x=3+√5

Then,

2x³-9x²-10x+13

=2(3+√5)³ - 9(3+√5)² - 10(3+√5) + 13

=2(27 + 5√5 + 27√5 + 45) - 9(9+6√5+5) - 30 -10√5 + 13

=144 + 64√5 - 126 - 54√5 -17 - 10√5

=1

So, (C) is correct