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3 years ago

6

Israel started to solve a radical equation in this way:

2 answers:

stira [4]3 years ago

8 0

I think the correct answer from the choices listed above is option D. The mistake that he did was that he did not check extraneous solutions.

√(-2 + 6 ) - 4 = - 2
√2 - 4 = -2
- 2 = - 2
and: √(- 5 + 6 ) - 4 = - 5
√ 1 - 4 = - 5
- 3 ≠ - 5

Therefore, x = - 5 does not work.

BartSMP [9]3 years ago

4 0

Only x = - 2 works in the original equation.
√(-2 + 6 ) - 4 = - 2
√2 - 4 = -2
- 2 = - 2
and: √(- 5 + 6 ) - 4 = - 5
√ 1 - 4 = - 5
- 3 ≠ - 5 ( x = - 5 does not work ).
Answer: D ) He did not check for extraneous solutions.

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Suppose a right cylinder was bent into a U-shape and was compared to another right cylinder. What can be said about their volume

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Step-by-step explanation:

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We could see from the figure attached how this shape looks like.

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Solve the word problem. Olivia has 21 coins in her drawer. Nine of the coins are nickels, and the rest are pennies. What is the

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3 years ago

A second number is 7 less than the first number. The third number is twice the first number. If the sum of the three numbers is

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Answer:

x=4

Step-by-step explanation:

hope it will help

First no.=x

2nd no.=2x

3rd no. =2x+6

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5×=26-6

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3 years ago

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3 years ago

A bag contains 150 marbles. Some are blue, and the rest are white. There are 21 blue marbles for every 4 white marbles. How many

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Given:

Total number of marbles in the bag = 150

There are 21 blue marbles for every 4 white marbles.

To find:

The number of blue marbles in the bag.

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Since, there are 21 blue marbles for every 4 white marbles, therefore the ratio of blue marble to white marbles is 21:4.

Let the number of blue marbles be 21x and white marbles be 4x.

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Divide both sides by 25.

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Now,

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$\text{Blue marbles}=21(6)$

$\text{Blue marbles}=126$

Therefore, the number of blue marbles is 126.

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3 years ago