Mathematics: Which is equivalent to (9y2 – 4x)(9y2 + 4x), and what type of special product is it?

Which is equivalent to (9y2 – 4x)(9y2 + 4x), and

Ответ:

bonnysvalentine

06.01.2022

This is an example of the difference of squares.

a^2 - b^2 = (a-b)(a+b)

So to find the product of (9y² – 4x)(9y² + 4x), we use the formula for the difference of squares.

$(9y^2 - 4x)(9y^2 + 4x)\\\\=(9y^2)^2 -(4x)^2\\\\=\boxed{\bf{81y^4 - 16x^2}}$

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Ответ:

pmdm95

30.11.2021

Mathematics

4080

Step-by-step explanation:

Declining by 1.7 % ( = 0.017) each year mean that each year the population is 0.983 8 previous.

So after 7 years ( that is in 2023) the population will be about

4600 * 0.983^7

= 4080

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Which is equivalent to (9y2 – 4x)(9y2 + 4x), and what type of special product is it?

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