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anonymous
 one year ago
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If (8z − 9)(8z + 9) = az^2 − b, what is the value of a?
The value of a is____
anonymous
 one year ago
Fan and medal*** If (8z − 9)(8z + 9) = az^2 − b, what is the value of a? The value of a is____

This Question is Closed

jtvatsim
 one year ago
Best ResponseYou've already chosen the best response.1Probably as a first step you should multiply the two parentheses on the left. That may help you get started on the problem. Are you comfortable with doing that?

anonymous
 one year ago
Best ResponseYou've already chosen the best response.0yes, let me multiply

jtvatsim
 one year ago
Best ResponseYou've already chosen the best response.1Alright, sounds good. :)

anonymous
 one year ago
Best ResponseYou've already chosen the best response.064z^2 81 I don't know if I did right

jtvatsim
 one year ago
Best ResponseYou've already chosen the best response.1You did it perfectly! Nice job

jtvatsim
 one year ago
Best ResponseYou've already chosen the best response.1Now look closely at the two equations they gave you 64z^2  81 = az^2  b notice that they both "look" the same. They both have a z^2 term. They both have a subtraction. And they both have "something" in front of the z^2 term.

anonymous
 one year ago
Best ResponseYou've already chosen the best response.0yes,i see so what I need to do now?

jtvatsim
 one year ago
Best ResponseYou've already chosen the best response.1Well, we can simply look and visually see that "a" must be 64. There is no other way that these two equations can be equal. In fact, for a bonus, I can also see that "b" must be 81.

jtvatsim
 one year ago
Best ResponseYou've already chosen the best response.1Mathematicians call this "having the same form." We were able to take the parentheses and transform them into an equation that had the same form as the equation on the right. Then, solving the problem is easy and we can trust our intuition.

jtvatsim
 one year ago
Best ResponseYou've already chosen the best response.1It's a little bit of a stretch to see it. So let me know if you have any questions. :)

anonymous
 one year ago
Best ResponseYou've already chosen the best response.0so wait, its the answer its 81

jtvatsim
 one year ago
Best ResponseYou've already chosen the best response.1Not quite. They want to know what the value of "a" is. "a" must be 64. I threw in the part about b as a bonus just so you could see that as well.

jtvatsim
 one year ago
Best ResponseYou've already chosen the best response.1Basically, the question just wants you to answer "What is the number in front of the z^2?" Instead of keeping it simple, though, they tried to get fancy by setting equations equal. It's the same thing though.

anonymous
 one year ago
Best ResponseYou've already chosen the best response.0yea I see can you check my answer for a different question please I already have the answer I just want to check

anonymous
 one year ago
Best ResponseYou've already chosen the best response.0Choose the correct simplification of 7x^2(6x + 3x^2 − 4). my answer: 21x^4 + 42x^3  28x^2

jtvatsim
 one year ago
Best ResponseYou've already chosen the best response.1Yep looks good. They tried to trick you be playing the 3x^2 in the middle, but looks like you got it. And you kept all the signs straight. Nice!
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