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2 years ago

Describe the error made in subtracting the two rational expressions shown

Mathematics

2 answers:

Andru [333]2 years ago

8 0

Answer:

The minus sign between the two fractions was not distributed correctly.

Step-by-step explanation:

The error made in this solution of rational fractions' subtraction is that the minus sign between the two terms will change the signs of numerator of second fraction so the numerator in the answer will be 3.

The correct solution is:

$\frac{1}{x-2} - \frac{1}{x+1}\\=\frac{x+1}{(x-2)(x+1)} - \frac{x-2}{(x-2)(x+1)}\\=\frac{x+1-(x-2)}{(x+1)(x-2)}\\=\frac{x+1-x+2}{(x+1)(x-2)}\\=\frac{3}{(x+1)(x-2)}$

Hence,

The error was in the last step of subtraction.

aev [14]2 years ago

6 0

Answer:

You must subtract all terms of the numerator being subtracted out, not just the first term.

The negative 2 should have been subtracted out to get a numerator of x+1 - x+2

The simplified numerator of the difference should be 3, not –1.

Step-by-step explanation:

got it right on edge 2020

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3 years ago

What is the apparent solution to the system of equations graphed above?

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tiny-mole [99]

Answer:

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Step-by-step explanation:

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We can see that the number of balls is the square of the row number. There are a total of 12 rows. So, rest of the rows has:

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Step-by-step explanation:

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Answer:

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So since the condition 1 and 2 are satisfied the correct option for this case would be:

a)np and nq must be respectively at least equal to 10

Step-by-step explanation:

Assuming the following options:

a)np and nq must be respectively at least equal to 10

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1) Randomization condition: We assume that we are selecting random samples so this condition is satisfied

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3) Success/ Failure condition:

For this case we need to satisfy this:

$np \geq 10, n(1-p)\geq 10$

So since the condition 1 and 2 are satisfied the correct option for this case would be:

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3 years ago