Question

can any one help me with this
X^3-7X-9=0

Answer 1

X~3.14092

Answer 2

u can solve this by trial and improvement
i root lies between 3 and 4
because f(3) = 27 -21-9 = -3
and f(4) = 64 -27 -9 = 28
try f(3.1) f(3.2) to get closer to the true root
a graph of the function will tell u how many real roots there are - could be only 1 or matbe 3

Answer 3

of course if u have agraphical calculator u can use that

Answer 4

ok ....thanks much