Homework Help: 8th Grade Algebra: Answer Check #2

Posted by Joy on Tuesday, January 20, 2009 at 11:20pm.

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?

8th Grade Algebra: Answer Check #2 - Reiny, Tuesday, January 20, 2009 at 11:27pm
check # 7,9,14

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

do those again.
8th Grade Algebra: Answer Check #2 - Joy, Tuesday, January 20, 2009 at 11:39pm
I am really lost on all of those 3 problems.

Help please?
8th Grade Algebra: Answer Check #2 - Reiny, Tuesday, January 20, 2009 at 11:48pm
#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
8th Grade Algebra: Answer Check #2 - Joy, Wednesday, January 21, 2009 at 12:20am
OHHH now I get it!

thank you very much!
8th Grade Algebra: Answer Check #2 - kim, Tuesday, April 7, 2009 at 4:46pm
y=x2+-24
- 8th Grade Algebra: Answer Check #2 - kim, Tuesday, April 7, 2009 at 4:47pm
  can u hlep me

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