Posted by Marissa on Saturday, August 18, 2007 at 1:53pm.
1)Write the expression 9n^6+7n^3-6 in quadratic form,if possible
I'm thinking C on this one but im not sure
A.-2,-square root of 6,square root of 6,2
B.-square root of 6,2,2i,i square root of 6
C.2,2,-isquare root of 6
D.-2i,2i,- square root of 6,square root of 6
3)If f(x)= x^2+1 and g(x)= x-2,find f[g(x)]
my answer is B
4)Find the inverse of f(x)= 2x-7
5)Determine which pair of functions are inverses:
A.f(x)= 3x-1;g(x)= 1/3x-1
B.f(x)= 2x-5;g(x)= x+5/2
C.f(x)= 2x+2;g(x)= 2x-2
D.f(x)= 3x-8;g(x)= 1/3x+8
my answer is D or B
f[g(x)] = (x-2)^2 + 1
= x^2 -4x +5
Follow the same procedure you did for number 4
1. C is right
2. b^4 + 2b^2 - 24 = 0
b^4 + 2b^2 = 24
b^4 + 2b^2 + 1
= 24 + 1
(b^2 + 1)^2 = 25
b^2 + 1 = ± 5
b^2 = 4 or b^2 = -6
b= ±2 or b= ±i√6
3. I got A
= (x-2)^2 + 1
= x^2 - 4x + 4 + 1
= x^2 - 4x + 5
4. ok if you include brackets as in (x+7)/2
5 ok if you include brackets as in (x+5)/2 and (1/3)(x+8)
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