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3 years ago

I need help with this can someone please help me I'm bad at fractions.

Mathematics

1 answer:

Artemon [7]3 years ago

5 0

The answer is 29, I just didn’t on my head right now.

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Solve 2x^3+7x^2-2x-1=o

Mashcka [7]

Answer:

$x=\sqrt{3}-2\\x=-\sqrt{3}-2\\x=\frac{1}{2}$

Step-by-step explanation:

This is a hard one

We have to use the rational root theorem

$2x^3+7x^2-2x-1$ = 0

We have to find all the factors of a and d and put them in a fraction

$a=2\\d=-1\\\frac{1}{1,2}$

We then plug them into the equation to see if any of them work

The equation isn't true when plugging 1, but is true when plugging in 1/2

factored form of 1/2 is (2x-1)

Then we divide the original equation by (2x-1) (you can use synthetic division or long division, it would be hard to type out the process for that) to get $x^2+4x+1$

So now the equation is $(2x-1)(x^2+4x+1)$

Solve the second half of this equation using the quadratic formula to get

$\sqrt{3}-2$ and $-\sqrt{3}-2$

We already know the solution for the first half of the equation (1/2)

So the final answers are:

$x=\sqrt{3}-2, -\sqrt{3}-2, \frac{1}{2}$

8 0

3 years ago

57:53

Pepsi [2]

7d = 56 minus the x in the middle

6 0

2 years ago

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Find the minimum, first quartile, median, third quartile, and maximum of each data set, 12, 10, 11, 7, 9, 10, 5

Sliva [168]

To find the median:
Least to greatest order:

5, 7, 9, 10, 10, 11, 12

10 is the number in the middle. Therefore the median is 10

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3 years ago

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A closed cylindrical tank has a height of 200 cm and a diameter of 126 cm

olasank [31]

Area of the sheet used to make the tank = total surface area of the cylinder = 2 $\pi$ r(r+h) = 2 x 22/7 x 63 x 263 = 104148 sq. cm.

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3 years ago

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Need help converting an equation to intercept form...

pickupchik [31]

y = x2 + 5x + 36
y = (x2 − 5x − 36) y = (x2 − 9x + 4x − 36) y = [x (x − 9) + 4 (x − 9)] y = (x − 9)(x + 4)

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3 years ago