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# Maths - Just checking... watch

1. A) If you have
5x^5 + 7x - 2 (MINUS (-) THE FOLLOWING)
4x^5 - 2x^3 + 7

Would you get
x^5 - 2x^3 + 7x - 9 OR
x^5 + 2x^3 + 7x - 9

B) If I have
(3x^2 + 2x + 4)(4x^3 + 7x + 6)
Do you get:
12x^5 + 8x^4 + 37x^3 + 32x^2 + 40x + 24

????
2. (Original post by virtuality)
A) If you have
5x^5 + 7x - 2 (MINUS (-) THE FOLLOWING)
4x^5 - 2x^3 + 7

Would you get
x^5 - 2x^3 + 7x - 9 OR
x^5 + 2x^3 + 7x - 9

B) If I have
(3x^2 + 2x + 4)(4x^3 + 7x + 6)
Do you get:
12x^5 + 8x^4 + 37x^3 + 32x^2 + 40x + 24

????
A.) (5X^5 + 7x - 2) - (4x^5 - 2x^3 + 7)

---> x^5 + 2x^3 + 7x -9

B.) (3x^2 + 2x + 4)(4x^3 + 7x + 6)

---> 12X^5 + 21X^3 + 18X^2 + 8X^4 + 14X^2 + 12X + 16X^3 + 28X + 24

----> 12X^5 + 8X^4 + 37X^3 + 32X^2 + 40X + 24
3. a) x^5 + 2x^3 + 7x - 9
b) yes, correct
4. (Original post by JamesF)
a) x^5 + 2x^3 + 7x - 9
b) yes, correct
Beat you to it!
5. Thanks! I always think I'm wrong.
6. (Original post by virtuality)
Thanks! I always think I'm wrong.
The back of the textbook is always wrong!
7. (Original post by bono)
Beat you to it!
Ah yes, but 7x + 2x^3 doesnt equal 9x^3
8. (Original post by JamesF)
Ah yes, but 7x + 2x^3 doesnt equal 9x^3
9. (Original post by JamesF)
Ah yes, but 7x + 2x^3 doesnt equal 9x^3
I knew going to bed at 4am wasn't a good idea!

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Updated: March 13, 2004
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