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Andru [333]
3 years ago
5

Can someone help me please!!​

Mathematics
2 answers:
Lynna [10]3 years ago
8 0

Answer:

b because the value are correct

Step-by-step explanation:

Vladimir [108]3 years ago
4 0

Answer:

Yes I can. So I will.

Step-by-step explanation:

Anytime you found yourself in doubt and danger about equations, you can use Geogebra Graph Calc - search for it -, and he will show you the graphic.

But, as I know that you are one the <em>LAST HEROES IN EARTH,</em> I pretty sure you don't want to just surrender yourself for a computer machine.

Let's calculate it:

4x² - 39x + 77

Bháskara Formula, you probably know her as <em>Resolutive Formula</em>, as she is known in my country, is:

BF=\frac{-b \sqrt[]{b^2 - 4ac} }{2a} there is also two signals + - betwen -b and the root.

She's one of the best ways to find roots for quadratic equations.

We will need to do that to find the interval required.

Also, remember that a generic quadratic equation can be describe as:

ax² + bx + c

So, knowing that in this equation

a = 4 / b = -39 / c = 77

We can proceed.

x' = - (-39) + \sqrt[]{(-39)^2 - 4.4.77}/ 2.4

x' = 39 + 17/ 8

x' = 7

x'' = 39 -17/8

x'' = 2,75

Now, you should know that when A > 0 the quadratic equation has her concavity facing down.

As we have the values of the roots, 7 and 2,75, we know that betwen them the equation has negative values.

That also means that all values higher than 7 and lower than 2,75 give to us a positive value.

Final answer:

x<2,75 and x>7

You will see in annex the graphic.

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