Simplify the following polynomial problems?

Question

I think I have the answer please show me what I did wrong if my answer isnt right, so I can learn from this.

1, (7m-8)² - correct answer is A?

a 49m² + 64

b 49m² - 112m + 64

c, 49m² - 30m + 64

2. (3^5)(-m)^4 - correct answer is A?

a 3m^4w^5

b -12m^4w^5

c 3w^5 + m^4

3. 2a(3a^3 - 7a² +a) - (6a^3 - 4a² - 8) I think its D

a 6a^4 - 20^3 + 6a² + 8

b 6a^4 - 8^3 + 6a² - 8

d. None of these

4. (x + 3)(x² + 5x -4) I think its A

a x^3 + 8x² + 11 - 12

b x^3 + 8x² + 4x - 12

c x^3 + 8x² - 11 - 12

5. a²(r^-3s)-2 / (a^5r^3s^3 I think its C

a 1/(a^3r^4s^5)

b r^3/(a^3s^5)

c r^3/(a^3s)

Answer 1

1. (7m - 8)² = (7m - 8)(7m - 8) = 49m² - 56m - 56m + 64 = 49m² - 112m + 64

Don't take shortcuts. The best bet is to work it out step-by-step :-)

2. Where is "w"? I assume it's between the "3" and the "^5". If so, the answer is A, as you have chosen.

3. 2a(3a³ - 7a² +a) - (6a³ - 4a² - 8) = 6a^4 - 14a³ + 2a² - 6a³ + 4a² + 8 = 6a^4 - 20a³ + 6a² + 8. This means the answer is A.

4. You are correct.

5. This one is missing at least a parenthesis... I think you can handle it from here, though. Good luck!