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3 years ago

Using the quadratic formula to solve x2 + 20 = 2x, what are the values of x?

Mathematics

1 answer:

cluponka [151]3 years ago

3 0

Step-by-step explanation:

x² + 20 = 2x

x² − 2x + 20 = 0

x = [ -b ± √(b² − 4ac) ] / 2a

x = [ -(-2) ± √((-2)² − 4(1)(20)) ] / 2(1)

x = [ 2 ± √(4 − 80) ] / 2

x = [ 2 ± √(-76) ] / 2

x = [ 2 ± 2i√19 ] / 2

x = 1 ± i√19

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Berto has $12 to put gas in his car. If gas costs $3.75 per gallon, which ordered pair relating number of gallons of gas, x, to

AlexFokin [52]

Answer:

about 3.2 gallons. (3.2, 12)

Step-by-step explanation:

If gas costs $3.75 per gallon and Berto has $12, then he can purchase 12/3.75 gallons. This is approximately 3.2 gallons. So the coordinate on this line would be (3.2, 12)

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3 years ago

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The height of a standard doorway in a home is 80 inches. What is the metric equivalent in centimeters?

poizon [28]

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4 years ago

The numbers 0 through 9 are used in code groups of four to identify an item of clothing. Code 1083 might identify a blue blouse,

choli [55]

Answer: 5040

Step-by-step explanation:

Given : Number of choices to make a four digit code ( 0 to 9)= 10

If repetition is not allowed , then we use Permutations to find the number of different code groups can be designed.

The number of permutations of n things , taking r at a time is given by :-

$^nP_r=\dfrac{n!}{(n-r)!}$

Then, the number of permutations of 10 numbers , taking 4 at a time is given by :-

$^{10}P_{4}=\dfrac{10!}{(10-4)!}\\\\=\dfrac{10\times9\times8\times7\times6!}{6!}\\\\=\dfrac{10\times9\times8\times7}{1}\\\\=5040$

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4 years ago

For a homework question, Linda is asked to rewrite the expression (x3⋅x)2 ( x 3 ⋅ x ) 2 in the form xk. x k . Linda claims that

andre [41]

Answer:

k=8

Step-by-step explanation:

Question says that given expression is $\left(x^3\cdot x\right)^2$

Now we need to rewrite that expression in form of $x^k$ .

To do that we need to simplify given problem $\left(x^3\cdot x\right)^2$ .

x is same as $x^1$

$=\left(x^3\cdot x^1\right)^2$

we can begin with inner parenthesis

$=\left(x^{3+1}\right)^2$

$=\left(x^{4}\right)^2$

$=x^{4*2}$

$=x^8$

Now compare that with $=x^k$ , we get:

k=8

Which is different value that Linda got.

Hence answer of the Linda is wrong.

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4 years ago

2 - 20

Damm [24]

Answer:

The answer is 15=15

Step-by-step explanation:

go to math

way, which is a website

and put your question in and the answer waill come to you!

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3 years ago