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3 years ago

Log base4 (x+3)(x-3)=2pls I need it urgently

Mathematics

1 answer:

Shalnov [3]3 years ago

6 0

Answer:

x = 5 or -5

Step-by-step explanation:

if a = b, c^a = c^b

make each side the exponent of 4

4^[log base4 (x+3)(x-3)] = 4^2

since a^(log basea b) = b, (think of the definition of logs as the inverse of exponents here)

(x+3)((x-3) = 16

x^2 -9 = 16x^2 = 25

x = 5 or -5

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1. Which equation represents a line that is perpendicular to the line represented by 2x - y =7

shtirl [24]

Step-by-step explanation:

Given:

2x−y=7

Matching given equation with the variables,

a=2

and

b=−1 .

Swap "a" and "b"

-x + 2y = 7

Because b is negative, let's change that one:

x + 2y = 7

Is perpendicular to

2x−y=7

. Here is a graph to prove it:

The red line is

2x−y=7

The blue line is

x+2y=7

If you want the perpendicular line to go through a given point, then make the constant term on the right a variable (for example k)

x+2y=k

Now lets make the perpendicular line go through the point

(1,1)

by substituting 1 for x, 1 for y and the solving for k:

1+2(1)=k

k=3

The equation of the line that perpendicular to

2x−y=7 and goes through the point

(1,1)is:

x+2y=3

Please mark me as brainleist.

8 0

3 years ago

"5 subtracted from a number is a maximum of 14

olchik [2.2K]

Answer:

SIMPLY 14-5=9........

4 0

3 years ago

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2 years ago

Which of the following is NOT a possible value for the correlation coefficient? 1) negative 0.9 2) zero 3) positive 0.15 4) posi

AnnyKZ [126]

Answer:

4) positive 1.05

Step-by-step explanation:

Correlation:-

Correlation is a statistical measure that indicates the extent to which two or more variables fluctuate together.

Examples:i) The yield of a crop varies with the amount of rainfall

ii) The price of a commodity increases with the reduction in its supply and so on.

That is when the changes in one variable are associated or followed by changes in the other, is called correlation

positive correlation:- If an increase (or decrease ) in the values of one variable corresponds to an increase(or decrease ) in the other, then correlation is said to be positive.

negative correlation:- If an increase (or decrease ) in the values of one variable corresponds to an decrease(or increase ) in the other, then correlation is said to be negative.

no correlation:-

If there is no relationship indicated between the variables,they are said to be independent or uncorrelated.

uses of correlation:-it is used in presenting the average relationship between any two variables through a single value of co-efficient of correlation. correlation is a statistical technique that can show whether and how strongly pairs of variables are related.

The range of correlation is $-1\leq r\leq 1$