# 8th Grade Algebra: Answer Check #2

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{ 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?

• 8th Grade Algebra: Answer Check #2 -

check # 7,9,14

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

do those again.

• 8th Grade Algebra: Answer Check #2 -

I am really lost on all of those 3 problems.

• 8th Grade Algebra: Answer Check #2 -

#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 -

OHHH now I get it!

thank you very much!

• 8th Grade Algebra: Answer Check #2 -

y=x2+-24

• 8th Grade Algebra: Answer Check #2 -

can u help me

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