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Yuri [45]
3 years ago
6

A^2−8ab+16b^2=81, find a–4b

Mathematics
1 answer:
neonofarm [45]3 years ago
4 0

Answer:

-9, 9

Step-by-step explanation:

a² − 8ab + 16b² = 81

(a - 4b)² = 81      Wrote the left-hand side as a square

 a - 4b = ±9     Took the square root of each side

All values of a - 4b are -9 and +9.

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on the first of january 2014, carol invested some money in a bank account. The account pays 2.5% interest per year. On the first
almond37 [142]

Answer: £23,360

Step-by-step explanation:

You can use algebra to solve this.

Assume that the original investment is x.

In the beginning of 2015 the balance had increased by 2.5% which is denoted as:

= 1.025x

Carol then withdrew a thousand:

= 1.025x - 1,000

This value then increased by 2.5% again by the beginning of 2016:

= 1.025 * (1.025x - 1,000)

Relevant expression therefore is:

1.025 *(1.025x - 1,000) = 23,517.60

1.025x - 1,000 = 23,517.60/1.025

1.025x = ‭22,944‬ + 1,000

x = 23,944/1.025

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8 0
3 years ago
is a 50 percent increase followed by a 33 1/2 percent decrease same less or greatter than the original value
Nitella [24]

Answer:less than

Step-by-step explanation:

3 0
3 years ago
To which set or sets does -20 belong to, whole numbers, rational numbers or integers
Bad White [126]
It belongs to all of them.
4 0
3 years ago
The sum of three consecutive odd integers is 57. what are the three integers
asambeis [7]

Answer:

17,19,21

Step-by-step explanation:

let the first odd number be "x"

formular : (x)+(x+2)+(x+4).

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3x=57-6

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x=51/3

x=17

apply the formular.

17,(17+2),(17+4)

17,19,21.

6 0
3 years ago
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