# 8th Grade Algebra: Answer Check #2

{ 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

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

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. 👁 139
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.

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

## 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 21, 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 17, 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