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3 years ago

-3x^2+2xy-y^3 for x = 5 and y = -1

Mathematics

2 answers:

Alex_Xolod [135]3 years ago

4 0

Answer:

Step-by-step explanation:

Evaluate for x=5,y=−1

−3(5^2)+(2)(5)(−1)−(−1)^3

=−84

denis-greek [22]3 years ago

3 0

The answer would be 66

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25^(x+2) = (1/5)^(4x)

dangina [55]

The first step for solving this equation is to write $25^{x+2}$ in exponential form with a base of 5.
$5^{2x+4}$ = $( \frac{1}{5}) ^{4x}$
Write $( \frac{1}{5}) ^{4x}$ in exponential form with a base of 5.
$5^{2x+4}$ = $5^{-4x}$
Since the bases on both sides of the equal are the same,, set the exponents equal.
2x + 4 = -4x
Move the constant to the right side of the equation and then change its sign.
2x = -4x - 4
Now move the variable to the left side and change its sign.
2x + 4x = -4
Collect the terms with an x variable.
6x = -4
Lastly,, divide both sides of the equation by 6 to get your final answer.
x = $- \frac{2}{3}$
Let me know if you have any further questions.
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8 0

3 years ago

NEED THIS DONE ASAP PLEASE ANSWER WITH FULL WORK

Travka [436]

The function of the table is quadratic in nature and is given as follows: y = 2x² -1

<h3>What is a quadratic function?</h3>

A quadratic function is one of the following: f(x) = ax² + bx + c, where a, b, and c are positive integers and a, b, and are not equal to zero.

Given the nature of a quadratic function (y = ax² + bx + c) we pick three pairs of (x, y) from the table as follows:

A) (0, -1)

B) (1, 1)

C) (2, 7)

Then we say:

A) (0, -1) → -1 = a(0)² + b(0) + c =

-1 = c ..................................1

B) (1, 1) → 1 = a(1)² + b(1) + c =

1 = a + b + c.......................2

C) (2, 7) → 7 = a(2)² + b(2) + c

7 = a (4) + 2b + c

7 = 4a + 2b + c .................3

Using elimination and substitution, let us substitute equation 1 into equation 2;

that is

1 = a + b + (-1)

1 = a + b -1
1 + 1 = a + b

2 = a + b................................4

From the above we can also say,

b = 2 - a...................................5

substitute 5 into 3 we have

7 = 4a + 2 (2-a) + (-1)

7 = 4a + 4 - 2a - 1

7 = 4a - 2a + 4 - 1

7 = 2a + 3

7- 3 = 2a

4 = 2a

a = 4/2

a = 2

taking [a = 2] and [c = -1], subsitute these into equation 2

1 = a + b + c

1 = 2 + b + (-1)

1 = 2 + b - 1

1 = 2 - 1 + b

1 = 1 + b

b = 1-1

b= 0

Hence,

a = 2

b = 0

c = -1

Hence:

y = 2 * x² + (0) x + (-1)

y = 2x² -1

Hence the equation for the above table is y = 2x² -1

Learn more about Quadratic Functions:
brainly.com/question/1214333

#SPJ1

8 0

1 year ago

What is the answer to 16=d+3

Vlada [557]

Hello !!

$\rule{300}{5}$

$\huge\blue{\mid{\fbox{\tt{ANSWER:-\:}}\mid}}$

$d = 13$

<h2><em>EXPLANATION :</em></h2><h2><em /></h2>

Switch sides:

$16 = d~+~3$

Subtract 3 from both sides:

$d~+~3 ~-~3=16 ~-~3$

Simplify:

$d = 13$

$\huge\blue{\mid{\fbox{\tt{ANSWER:-\:}}\mid}}$

$d = 13$

Hope It Helps. . .

#LearnWithBrainly

$A~n~s~w~e~r~:$

Jace ^-^

7 0

3 years ago

Please answer the following:

balandron [24]

Answer: The first two recipes will taste the same. The third one will taste different.

Step-by-step explanation: The first two recipes have the same ratio of 2 orange juice to 3 pineapple juice.

8 0

3 years ago

Read 2 more answers

A tree is 28.05 feet tall. What is its height in meters? Use the following conversion: 1 meter is 3.3 feet.

Mariulka [41]

Answer:

It is 8.5 meters tall

Step-by-step explanation:

28.05 / 3.3 = 8.5

3 0

3 years ago