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Mathematics 21 Online
OpenStudy (anonymous):

Factor 64x^2+25

OpenStudy (mathmate):

This is of the form (a^2+b^2) for which there are no real/rational factors. Check the question carefully to see if there is a typo.

OpenStudy (anonymous):

(8x+5)(8x-5)

OpenStudy (lynfran):

is that ur answer? (8x+5)(8x-5) if so thats not correct since when we foil it out we will have 8x*8x+8x*-5+5*8x+5*-5 which gives 64x^2 -40x +40x -25 64x^2-25 ...

OpenStudy (anonymous):

Yeah I agree with @LynFran (8x+5)(8x−5) =(8x+5)(8x+−5) =(8x)(8x)+(8x)(−5)+(5)(8x)+(5)(−5) =64x^2−40x+40x−25 =64x^2−25

OpenStudy (anonymous):

Hmmm...so what should I do?

OpenStudy (anonymous):

Well, I don't think 64x^2+25 can be factored. Don't judge me...thats my perspective :|

OpenStudy (anonymous):

What if we used the quad formula?

OpenStudy (anonymous):

Hold on...let me solve it.

OpenStudy (anonymous):

i got x=-5/8 or x=5/8

OpenStudy (anonymous):

I got 64x^27 :O

OpenStudy (anonymous):

Ugh! I don't know what to do haha

OpenStudy (anonymous):

Are you sure this is the question? :O Even no calculator could solve it!

OpenStudy (lynfran):

|dw:1439783529269:dw|

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