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loris [4]
3 years ago
7

I need help now plz​

Mathematics
1 answer:
Romashka-Z-Leto [24]3 years ago
6 0

Answer:

C

Step-by-step explanation:

The picture is a bit blurry, but from what i can see, i'd say C (whichever one has -4 x 3 x 1 under the square root.)

So for this, you need to know the quadratic formula, which is:

\frac{-b ± \sqrt{b^{2} -4ac} }{2a}

<em>*ignore the weird capital A, it keeps coming up when i try to use the ± symbol</em>

They have given you the equation of a quadratic, so the first thing you have to do is rearrange it, so that x^{2} comes first.

<u>So now we have the equation: 3</u>x^{2}<u> - 2x +1</u>

*the quadratic formula uses a, b and c, but they are specific. a is always the coefficient of x^{2} , b is always the coefficient of x and c is always the constant (number without an x)

<u>So, i can find that, in this case:</u>

a = 3      b= -2    c=1

<u>Now substitute each of those values it into the original quadratic equation:</u>

<u />

\frac{-(-2) ± \sqrt{(-2)^{2} -4(3)(1)} }{2(3)}

<em>*again, ignore the weird capital A. </em>

That's how you find the answer, which from what i can tell in the picture is C.

Hope that helped : )

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Vsevolod [243]
....the answer is -8,8
6 0
3 years ago
Read 2 more answers
Anyone wanna help me with my homework? 15 points to whoever can answer these to questions. :)
Alona [7]
Well, company (A) has a deposit of $10

Company (B) has one of $20
4 0
3 years ago
Kenji simplifies 3^5 x 4^ 5and gets the result 12^10, but Darlene is not sure. Is Kenji correct? Justify your answer.
V125BC [204]

That's a question about exponentiation.

Answer:

Kenji is wrong because he does not aply the porperty correctly.

Step-by-step explanation:

A exponetiation has this form:

\boxed{a^b}

<em>a </em>is the base

<em>b</em> is the power or exponent

To understand that situation it's important to know a property about exponentiation. When we have a multiplication with the same exponent and diferent bases, the result is the multiplication of the bases with the same exponent. Let's see this above, in mathematical language:

\boxed{a^b \cdot c^b = (a\cdot c) ^b}

Examples:

  • 2^3 \cdot 8^3 = (2 \cdot 8) ^3 = 16^3
  • 10^9 \cdot 23^9 = (10 \cdot 23) ^9 = 230^9

Now, we can say why Kenji is wrong. It's easy simplify 3^5 \cdot 4^5! We know that the result is (3 \cdot 4) ^5 = 12^5, but Kenji multiplied the bases and added the exponents, that's why he is wrong.

I hope I've helped. ^^

Enjoy your studies! \o/

3 0
3 years ago
Hii please help i’ll give brainliest
Zepler [3.9K]

Answer:

C- the third one

Step-by-step explanation:

It is the only one that shows the dot on -2

if this helps, brainliest, please?????

3 0
3 years ago
Read 2 more answers
How do you solve this: In ?PQR, PQ = 39 cm and PN is an altitude. Find PR if QN = 36 cm and RN = 8 cm.
ikadub [295]

Answer:

PR = 17 cm


Step-by-step explanation:

Given  :

In ΔPQR,

PQ = 39 cm

PN is an altitude.

QN = 36 cm

RN = 8 cm.

To Find : Length of PR

Solution :

Since we are given that PN is an altitude .

So, PN divides ΔPQR in two right angled triangles named as ΔPQN and ΔPRN. (Refer attached file)

So, first we find Length of PN in ΔPQN using Pythagoras theorem i.e.

(Hypotenuse)^{2}=(Perpendicular)^{2} +(Base)^{2}

(PQ)^{2}=(PN)^{2} +(QN)^{2}

(39)^{2}=(PN)^{2} +(36)^{2}

1521=(PN)^{2} +1296

1521 -1296=(PN)^{2}

225=(PN)^{2}

\sqrt{225} = PN

15 = PN

Thus, Length of PN = 15cm

Now to find length of PR we will use Pythagoras theorem in ΔPRN.

(PR)^{2}=(PN)^{2} +(NR)^{2}

(PR)^{2}=(15)^{2} +(8)^{2}

(PR)^{2}=225 +64

(PR)^{2}=289

PR= \sqrt{289}

PR= 17

Hence the length of PR = 17 cm



3 0
3 years ago
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