If (8z − 9)(8z + 9) = az2 − b, what is the value of a? The value of a is ____________.

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If (8z − 9)(8z + 9) = az2 − b, what is the value of a? The value of a is ____________.

Mathematics
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Im pretty sure its 8 but i want to be sure
what did you get for the expansion of (8x - 9)(8z + 9)?
it is distributive property the coefficients are multiplied \((ax+b) (ax-c) = (ax \times ax) - (ax \times c) + (ax \times c) - (b\times c)\) if you focused on a, it will be \(a \times a = a^2 \)

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Other answers:

i dont understand
how you got that
I am providing the general idea without answering your own homework.
multiply the left hand side and compare the coefficients according to the power of z
the coefficients in the first parenthesis will have to be multiplied to the coefficient in the second parenthesis
this question confuses me so bad, i dont understand what your saying, im sorry
what is a multiplied by a ?
2?
let us use an actual number \(2 \times 2 = ?\)
4
\(4 \times 4 = ? \)
WAIT its ^2 im so sorry
its az^2 − b
but you are not worried about z nor b you have to worry about a
ok ok, 8
no 16
how about \(8 \times 8 = ? \)
64
did you notice that \(2 \times 2 = 2^2\) \(4 \times 4 = 4^2\) \(8 \times 8 = 8^2\)
yes
so its 64??
yes, because the coefficient are both 8
if the coefficients were different then you will multiply them as well
Thankyou :)
can you help with one more?
maybe post it
Consider the functions f(x) = 2x + 1 and g(x) = x2 − 10. What is the value of f[g(3)]? 39 −3 −7 -1
its like the other one but i dont know it

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