Question

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

The value of a is ____________.

Answer 1

Im pretty sure its 8 but i want to be sure

Answer 2

what did you get for the expansion of (8x - 9)(8z + 9)?

Answer 3

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 \(a \times a = a^2 \)

Answer 4

i dont understand

Answer 5

how you got that

Answer 6

I am providing the general idea without answering your own homework.

Answer 7

multiply the left hand side and compare the coefficients according to the power of z

Answer 8

the coefficients in the first parenthesis will have to be multiplied to the coefficient in the second parenthesis

Answer 9

@lealealea222

Answer 10

this question confuses me so bad, i dont understand what your saying, im sorry

Answer 11

what is a multiplied by a ?

Answer 12

2?

Answer 13

let us use an actual number
\(2 \times 2 = ?\)

Answer 14

4

Answer 15

\(4 \times 4 = ? \)

Answer 16

WAIT its ^2 im so sorry

Answer 17

its az^2 − b

Answer 18

but you are not worried about z nor b
you have to worry about a

Answer 19

ok ok, 8

Answer 20

no 16

Answer 21

how about
\(8 \times 8 = ? \)

Answer 22

64

Answer 23

did you notice that
\(2 \times 2 = 2^2\)
\(4 \times 4 = 4^2\)
\(8 \times 8 = 8^2\)

Answer 24

yes

Answer 25

so its 64??

Answer 26

yes, because the coefficient are both 8

Answer 27

if the coefficients were different then you will multiply them as well

Answer 28

Thankyou :)

Answer 29

can you help with one more?

Answer 30

maybe
post it

Answer 31

Consider the functions f(x) = 2x + 1 and g(x) = x2 − 10. What is the value of f[g(3)]?

39
−3
−7
-1

Answer 32

its like the other one but i dont know it

Answer 33

@nincompoop