Some one help

Dominic

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Jun 16, 2005
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Find the product: (2x + 6)(x -10)

(2x + 6)(x-10)=12x(x-10)

Answer:

12x^2 - 10

Right or wrong?
 

tkhunny

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Apr 12, 2005
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Dominic said:
Find the product: (2x + 6)(x -10)
Can you say "FOIL"?

Remember how to multiply numbers long-hand? EVERY element of one number must be paired with EVERY element of the other number. The very same thing applies, here. FOIL is just one possible order that is easy enough to memorize.

(2x + 6)(x -10)

First: 2x * x = 2x^2
Outer: 2x * (-10) = -20x
Inner: 6 * x = 6x
Last: 6 * (-10) = -60

Bring it all together:
2x^2 - 20x + 6x - 60

Simplify:
2x^2 - 14x - 60
 

Dominic

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Jun 16, 2005
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69
Thank you. I understand know. The way you explained this to me is way better than the way the book tells you how to do it.
 

~Midnight.Kitten~

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Jun 27, 2005
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87
what does ^ mean? in the answer i mean
 

tkhunny

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Standard text-based version of exponentiation.

x^2 = x<sup>2</sup>

Sometimes I'm just too lazy to type in the HTML tags.
 
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