If x = -2, calculate the value of: xcubed + xsquared

Mathematics

2 answers:

laiz [17]3 years ago

6 0

-2*-2*-2 = ?
-2*-2 = ?
-8+4= -4
answer is -4

Elan Coil [88]3 years ago

5 0

X cubed = -8

-2 x -2 = 4
4 x -2 = -8

x squared = 4

-2 x -2 = 4

-8 + 4 = -4

xcubed +xsquared = -4

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Hey can you please help me posted picture of question

Dmitry_Shevchenko [17]

Answer:
The solutions are:
$\frac{3 + i}{2}$ and $\frac{3 - i}{2}$

Explanation:
The general form of the quadratic equation is:
ax² + bx + c = 0
The given equation is:
2x² - 6x + 5 = 0

By comparison:
a = 2
b = -6
c = 5

Now, to get the solutions of the equation, we will have to use the quadratic formula shown in the attached image.

By substituting in the formula, we would find that:
either x = $\frac{6 + \sqrt{(-6)^2 - 4(2)(5)} }{2(2)} = \frac{3 + i}{2}$

or x = $\frac{6 - \sqrt{(-6)^2 - 4(2)(5)} }{2(2)} = \frac{3 - i}{2}$

Hope this helps :)

4 0

3 years ago

Are the decimals 0.4 and 0.40 equal ?explain

iren [92.7K]

Yes, because no matter how many 0's are after the decimal, the number stays the same.

6 0

3 years ago

Read 2 more answers

100 POINTS!!! Brainliest if correct, I report if the answer is absurd. Don’t answer if don’t know.

Lena [83]

Answer: D

Step-by-step explanation:

To find the perimeter of the square, you want to first find the length of each side. Since the figure is a square, we know that each side is equal to each other. We can set the expressions equal to each other to find x.

$\frac{3}{4}x-1=\frac{1}{2}x+7$ [subtract both sides by 1/2x]