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Ray Of Light [21]

3 years ago

7

3 √ 7 + √ 7 can someone elaborate this for me

2 answers:

makkiz [27]3 years ago

4 0

Answer:

The answer is 4 \sqrt{7}.

Step-by-step explanation:

The formula is a\sqrt{x} + b\sqrt{x} = (a+b)\sqrt{x}, but if you don't understand it, here's an easier way to think about it.

You can think of \sqrt{7} as x (or any other variable). Now, the equation is 3x + x. If you've ever done algebra, (you probably have if square roots popped up on your homework) you know that this equals to 4x. Now, replace the x with \sqrt{7}, because we already decided that those two were equal. Therefore, the answer is

4 \sqrt{7}.

Iteru [2.4K]3 years ago

3 0

Answer:

9.3

Step-by-step explanation:

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Need the answer to this

ki77a [65]

Answer:

$\frac{2}{(x + 3)}$

Step-by-step explanation:

$\frac{2x - 10}{x^{2} - 2x - 15}$

pull 2 from top

$\frac{2(x - 5)}{x^{2} - 2x - 15}$

we are looking to cancel (x-5) so will start with

(x - 5)(x + 3), selected (x+3) because the sign must be negative and must multiply to -15

$\frac{2(x - 5)}{(x - 5)(x + 3)}$

now cancel (x-5)

$\frac{2}{(x + 3)}$

4 0

3 years ago

(9x+13)^2=49<br> Solve the quadratic equation given below.

Varvara68 [4.7K]

Answer:

x=(-2/3)

Step-by-step explanation:

(9x+13)^2=49

√(9x+13)^2=√49

9x+13=7

9x+13-13=7-13

9x=-6

9x÷9=-6/9

x=-6/9

-6/9=-2/3

3 0

4 years ago

Last weekend,Mandy collected 4 times as many shells as Cameron.Together how many shells did Mandy collect?write an equation and

shutvik [7]

Answer:

4x=y

Step-by-step explanation:

Mandy collects 4 times the amount that Cameron has, so Cameron's amount x 4 = Mandy's amount

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4 years ago

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e-lub [12.9K]

The answer is A. You can comment if u want an explanation :)

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3 years ago

-6.5+c=-4.12. How do you solve

Reptile [31]

Answer: c=2.38

Step-by-step explanation:

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3 years ago