# algebra

posted by .

1)Write the expression 9n^6+7n^3-6 in quadratic form,if possible
A.9(n^3)^3+7n^3-6
B.9(n^2)^3+7(n^2)-6
C.9(n^3)^2+7(n^3)-6
D.not possible
I'm thinking C on this one but im not sure

2)solve b^4+2b^2-24=0
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)]
A.x^2-4x+5
B.x^2-1
C.x^2-3
D.x^3-2x^2+x-2

4)Find the inverse of f(x)= 2x-7
=f-1(x)= x+7/2

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

2.) C
3.)A
f[g(x)] = (x-2)^2 + 1
= x^2 -4x +5

4.)correct

5.) B
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
f[g(x)]
= f(x-2)
= (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)

## Similar Questions

1. ### Math

What are the solution sets of the following 3 problems,the square root of x squared + 3x = x-3, the square root of 3x + 10 = x + 4 and finally the square root of 8x - 2 = the square root of 2x?
2. ### algebra

1.)correct 2.)wrong---> the first term is wrong 4(3a^2)^2 = 36a^4 3.) not sure on this one 4.) wrong---> - square root of six is not a solution Hope this Helps! 1)find p(-3)if p(x)=4x^3-5x^2+7x-10 =-184 2)If r(x)=4x^2-3x+7,find …
3. ### Math

Just need some help... Directions: Multiply or raise to the power as indicated... Then simplify the result. Assume all variables represent positive numbers. 1. 5(square root of 6) times two-thirds(square root of 15)= 3 one-third (square …
4. ### Algebra

Use the quadratic formula to solve the equation. Give exact answers: 2x^2 -1 = 6x. The choices are: a) -3 + square root(7)/2, -3 - square root(7)/2 b) 3 + square root(11)/2, 3 - square root(11)/2 c) 3 + square root(7)/2, 3 - square …
5. ### Algebra

Rationalize each expression by building perfect nth root factors for each denominator. Assume all variables represent positive quantities. I don’t understand how to compute these. Also I don’t have the square root sign so I typed …
6. ### College Algebra

I need some help with a handful of questions. I need to see the steps on how to get to the final answers. I would also appreciate if you can explain how you got to those steps. Rationalize each expression by building perfect nth root …
7. ### College Algebra help please

I need some help with a handful of questions. I need to see the steps on how to get to the final answers. I would also appreciate if you can explain how you got to those steps. Rationalize each expression by building perfect nth root …
8. ### College Algebra

I need some help with a handful of questions. I need to see the steps on how to get to the final answers. I would also appreciate if you can explain how you got to those steps. Rationalize each expression by building perfect nth root …
9. ### Math simplifying mixed radicals

Please help me simplify these following mixed radicals:: and show me how you did it cause I need to learn : I don't know how to type a square root sign so I just wrote square root and the numbers infront of the square root are supposed …
10. ### Math ~CHECK MY ANSWERS~

1) Which of these is a rational number? a. Pi b. square root 3 ****** c. square root 2 d. 1.3 (the # 3 has a line at the top) 2) Which of the following sets contains 3 irrational numbers?

More Similar Questions