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OpenStudy (anonymous):
If (9x − 4)(9x + 4) = ax 2 − b, what is the value of a?
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OpenStudy (anonymous):
@ganeshie8 @p@prowrestler @dan815 @sammixboo @Jhannybean @mathmath333
Vocaloid (vocaloid):
foil method (9x-4)*(9x+4) = 81x^2-16
OpenStudy (anonymous):
a can be 18 because 18x can =ax*2-b if b=1
OpenStudy (anonymous):
Okay, so @DaBest21 says 18. What about you @Vocaloid?
Vocaloid (vocaloid):
|dw:1437144374749:dw|
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Vocaloid (vocaloid):
find a
OpenStudy (anonymous):
6561...?
Vocaloid (vocaloid):
|dw:1437144456312:dw| look at the underlined parts
OpenStudy (anonymous):
A=81?
Vocaloid (vocaloid):
right
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OpenStudy (anonymous):
Okay, cool. Thanks! I will let you know if it is correct.
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