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2 years ago

2 square root of 8 multiplied by the square root of 20

Mathematics

2 answers:

Len [333]2 years ago

7 0

It is 25.2982212813 hope you have a good day

dybincka [34]2 years ago

6 0

Step-by-step explanation:

$2 \sqrt{8} \times \sqrt{20} \\ \\ = 2 \sqrt{4 \times 2} \times \sqrt{4 \times 5} \\ \\ = 2 \times 2 \sqrt{2} \times 2 \sqrt{5} \\ \\ = 8 \sqrt{2 \times 5} \\ \\ = 8\sqrt{10}$

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Find f(4) when f(x)=4x^2 - 2 x - 4

prisoha [69]

Answer:

Step-by-step explanation:

$f(x)=4x^2-2x-4$

$f(4)=4(4)^2-2(4)-4$ (I replaced $x$ with $(4)$ since we are to find $f(4)$ .)

$f(4)=4(16)-2(4)-4$ (By the order of operations, we take care of the exponents before whatever else we have here.)

$f(4)=64-8-4$ (By the order of operations, we take care of the multiplication as we see if left to right.)

$f(4)=56-4$ (By the order of operations, we perform addition/subtraction as we see it left to right.)

$f(4)=52$ (This completes the simplification.)

We could have also put this in our calculator as:

4(4)^2 - 2(4) - 4

This would have returned 52.

8 0

2 years ago

Help me please, brainliested :)

JulijaS [17]

Answer:

y=-1/3x-3

Step-by-step explanation:

8 0

2 years ago

Given the figure below, find the values of x and z. (10x - 65) (9x - 49)

nexus9112 [7]

(10x - 65) degrees is equal to (9x - 49) degrees, therefore you can set them into an equation.

(10x - 65) = (9x - 49)

By subtracting 9x in both sides,

(10x - 9x) - 65 = (9x -9x) - 49

x - 65 = -49

By adding 65 in both sides,

x - 65 + 65= -49 + 65
x = 16

Next, to find the value of z, it’s important to know that the straight line has 180 degrees. Then you would substitute the x value you found into one of your equation and subtract it from 180.

10 (16) - 65 = 160 - 65 = 95

Now you know that (10x - 65) degrees is equal to 95 degrees,

180 - 95 = z = 85

Answer: x = 16
z = 85

5 0

2 years ago

Answer with the explanation step by step

andrey2020 [161]

Answer:

The answer is A. $\frac{3(x-21)}{(x+7)(x-7)}$ .

Step-by-step explanation:

To find the difference of this problem, start by simplifying the denominator, which will look like $\frac{3}{x+7}-\frac{42}{(x+7)(x-7)}$ . Next, multiply $\frac{3}{x+7}$ by $\frac{x-7}{x-7}$ to create a fraction with a common denominator in order to subtract from $\frac{42}{(x+7)(x-7)}$ . The problem will now look like $\frac{3}{x+7}*\frac{x-7}{x-7}-\frac{42}{(x+7)(x-7)}$ .

Then, simplify the terms in the problem by first multiplying $\frac{3}{x+7}$ and $\frac{x-7}{x-7}$ , which will look like $\frac{3(x-7)}{(x+7)(x-7)}-\frac{42}{(x+7)(x-7)}$ . The next step is to combine the numerators over the common denominator, which will look like $\frac{3(x-7)-42}{(x+7)(x-7)}$ .

Next, simplify the numerator, and to simplify the numerator start by factoring 3 out of $3(x-7)-42$ , which will look like $\frac{3(x-7-14)}{(x+7)(x-7)}$ . Then, subtract 14 from -7, which will look like $\frac{3(x-21)}{(x+7)(x-7)}$ . The final answer will be $\frac{3(x-21)}{(x+7)(x-7)}$ .