Which binomial is a factor of 9x2 – 64? A. 3x – 8 B. 9x – 32 C. 3x + 32 D. 9x + 8

Question

anonymous · Answer

@ganeshie8

anonymous · Answer

@mathmale please help!!

mathmale · Answer

Review:  Please factor x^2 - y^2.

mathmale · Answer

If you have a textbook, look up "special products and factoring" for hints.
Otherwise, try looking that up on the Internet.

anonymous · Answer

$$\left( x+y \right) \left( x-y \right)$$

anonymous · Answer

wait thats wrong i think

mathmale · Answer

Great.   Now, for practice, factor  x^2 - 64.
By the way, your response was NOT wrong.

anonymous · Answer

ok thanks

anonymous · Answer

(x+8)(x−8)

mathmale · Answer

you're doing fine.  Now, for practice, factor 9x^2 - y^2.

anonymous · Answer

(3x+y)(3x−y)

mathmale · Answer

Very good!  Now, go back to the beginning and factor your original expression 9x^2 - 64.

anonymous · Answer

(3x+8)(3x−8)

anonymous · Answer

wow you have a lot of fans :o sorry off topic lol

mathmale · Answer

Thank you!  And you're 100% correct.

mathmale · Answer

Correct in your problem solution, I meant.  ;)

anonymous · Answer

oh i didn't see i answered the question thanks @mathmale :) you deserve a medal! and a new fan

mathmale · Answer

Again, thanks very much, mathman101!  Keep building your positive reputation!

anonymous · Answer

thanks :D

anonymous · Answer

so its a?

anonymous · Answer

oh it is nevermind lol XD