- #1
Helly123
- 581
- 20
Homework Statement
Homework Equations
for equation which has 2 different solutions, D >0
The Attempt at a Solution
(1)[/B] D > 0
b^2 - 4ac > 0
3 - 4root2.k > 0
k < 3 / ( 4root 2 )
k < ( 3 root 2 ) /8
has solution of sin tetha and cos tetha
sin 0 = 0, cos 0 = 1.
when x = 0, and x = 1 --> satisfy the rule?
when x = 0,
k = 0...
when x = 1,
k = 1/(root 3 - root 2)
can anyone help me to finish it?
(2) (x^3 + a/x^2)^5 = -270
something to the power 5 would be -270, means that something is negative
the factor of 270 = 3 x 3 x 3 x 5 x 2
can anyone help me to finish it?
(3) f( g(x) ) = 3gx + 1 / (2gx + 1)
x = 3gx + 1 / (2gx + 1)
and finally I get
2x^2 - 3x + 3 = -2px^2 + 3px + 3
(x1 + x2) on left equation = (x1 + x2) on right ?
-b/a = -b/a
3/2 = -3p/-2p
and x1.x2 on left equation = x1.x2 on right ?
c/a = c/a
3/2 = 3/-2p
p = -1
Is it right way?