8th Grade Algebra: Answer Check #2

Add or Subtract (Radicals)

{ this means squared

1.3{2 + 4{2 Answer: 7{2

2. 8{3 + 3{3 Answer: 11{3

3. 7{5 - 3{5 Answer: 4{5

4. 8{2 - 5{2 Answer: 3{2

5. 6{x + 7{x Answer: 13{x

6. 9{y + 3{y Answer: 12{y

Multiply

7. -3x^2(4x^2-3x-5) Answer: 12x^2

8.(3b+5)(b-3) Answer: 3b^2-4b-15

9.(6a^2-2)(a^2-1) Answer: -2a^2+2

10. (3p-2)(3p+2) Answer: 9p^2-4

11. (3x^2+4)(3x^2-4) Answer:9x^2-16

12. (x-9)^2 Answer: x^2-18x+81

13. (4x+3)(4x-3) Answer: 16x^2-9

14. (3x^2-2x)^2 Answer: -3x^2+4x

If I got any wrong, can someone please show me how to do them correctly?

  1. 0
  2. 0
  3. 31
asked by Joy
  1. check # 7,9,14

    #7 is way off, there should have been 3 terms.

    do those again.

    1. 0
    2. 0
    posted by Reiny
  2. I am really lost on all of those 3 problems.

    Help please?

    1. 0
    2. 0
    posted by Joy
  3. #7
    -3x^2(4x^2-3x-5) just expand
    = -12x^4 + 9x^3 + 15x^2

    #9
    (6a^2-2)(a^2-1)
    = 6a^4 - 6a^2 - 2a^2 + 2
    = 6a^4 - 8a^2 + 2

    #14

    (3x^2-2x)^2
    = (3x^2 - 2x)(3x^2 - 2x)
    = 9x^4 - 6x^3 - 6x^3 + 4x^2
    = 9x^4 - 12x^3 + 4x^2

    1. 0
    2. 0
    posted by Reiny
  4. OHHH now I get it!

    thank you very much!

    1. 0
    2. 0
    posted by Joy
  5. y=x2+-24

    1. 0
    2. 0
    posted by kim
  6. can u help me

    1. 0
    2. 0
    posted by kim

Respond to this Question

First Name

Your Response

Similar Questions

  1. math,algebra

    I need help if someone can show me the steps to these 2 problems. Problem #1 Use the properties for radicals to simplify each of the following expressions. Assume that all variables represent positive real numbers. radical and

    asked by jas20 on March 23, 2007
  2. math

    how do you add and subtract radicals?

    asked by Anonymous on April 27, 2010
  3. statistics

    Use summation notation to express each of the following calculations: a. Add 1 point to each score, then add the resulting values. b. Add 1 point to each score and square the result, then add the squared values. c. Add the scores

    asked by Liz on June 22, 2011
  4. statistics

    Use summation notation to express each of the following calculations: a. Add 1 point to each score, then add the resulting values. b. Add 1 point to each score and square the result, then add the squared values. c. Add the scores

    asked by Liz on June 22, 2011
  5. Algebra

    Solve the quadratic equation. 4x^2-8x+3=5 4x² - 8x +3 - 5 = 0 4x²- 8x - 2 = 0 2x²- 4x -1 = 0 this is as far as I got. I am stuck and do not know what to do next can some one please help? divide by two: x²- 2x -1/2 = 0 Now add

    asked by Jess on July 10, 2007
  6. Algebra

    Hello all! I had a quick homework question: I have to prove that the output of this always ends up as 1, regardless of the starting number: *Think of a number between 1 and 10. Add 1; double the result; add 3; subtract 4; add 5;

    asked by y912f on June 22, 2014
  7. algebra 2 multiple choice HELP

    find f(a), if f(t) = 2t2(squared)-t-2 A. 2(a+t)2(squared)-2t+1-2 B. 2(t+a)2(squared)-2(t+a)-2 C. 2a2(squared)-a-2 D. 4a2(squared)-2a-2 I put (squared) because the two in front of it means it's being squared... please help. thanks!

    asked by sara on November 30, 2010
  8. Inter. Algebra

    what is the answer to 12x squared y cubed /2xy squared +6xy * y squared +6y+9 /3y cubed +9y squared? You have not written an equation, only an algebraic function, with two variables. You need to add parentheses to clarify the

    asked by Andrea on December 2, 2006
  9. math

    The set S has the property that if a is in S, then a squared + a is also in S. What set could be S? The answer is {1,0}. How do you get this answer? What numbers squared are itself? one and zero But what exactly is a set and what

    asked by June on October 18, 2006
  10. math

    Match the equation with the step needed to solve it. 1. 2m - 1 = 3m subtract m 2. 2m = 1 + m subtract 2 3. m - 1 = 2 subtract 1 4. 2 + m = 3 subtract 2m 5. -2 + m = 1 add 2 6. 3 = 1 + m add 1

    asked by george on January 14, 2010

More Similar Questions