1answer.
Ask question
Login Signup
Ask question
All categories
  • English
  • Mathematics
  • Social Studies
  • Business
  • History
  • Health
  • Geography
  • Biology
  • Physics
  • Chemistry
  • Computers and Technology
  • Arts
  • World Languages
  • Spanish
  • French
  • German
  • Advanced Placement (AP)
  • SAT
  • Medicine
  • Law
  • Engineering
Kisachek [45]
3 years ago
7

Please answer the question from the attachment.

Mathematics
1 answer:
spin [16.1K]3 years ago
7 0

Hi,

7x²-2x-8=0, so a = 7, b= - 2, and c = -8.

You just need to apply the formula for square equations:

x_{1,2}=\dfrac{-b\pm\sqrt{b^2-4ac}}{2a}=\dfrac{-(-2)\pm\sqrt{(-2)^2-4\cdot 7\cdot (-8)}}{2\cdot 7}=\dfrac{2\pm\sqrt{228}}{14}=\dfrac{2\pm\sqrt{4\cdot 57}}{14}=\\\\=\dfrac{1\pm\sqrt{57}}7\Rightarrow x_1=\dfrac{1-\sqrt{57}}7,\;and\;x_2=\dfrac{1+\sqrt{57}}7.

Green eyes.

You might be interested in
30 = 12z - 18 Solve for z
zlopas [31]

Answer:

z = 4

Step-by-step explanation:

12z - 18 = 30

add 18 to both sides:

12z = 48

divide by 12:

z = 4

4 0
4 years ago
Read 2 more answers
Can someone help me find the volume of this?
Levart [38]
The answer is 194.4 cubic units
3 0
2 years ago
Read 2 more answers
A recipe needs 1/2 cup of water for every 2 cup at of sugar.if toy plan to use 8 cups of sugar,how much water will you need?
ollegr [7]

4 cups of water is your answer.

Step-by-step explanation:

7 0
3 years ago
What is the measure of A
SCORPION-xisa [38]

Answer:

A. 60°

Step-by-step explanation:

From the diagram, in triangle ABC,

AB=BC=CA=15 units.

This means triangle ABC is an equilateral triangle.

All angles in equilateral triangle are congruent. The sum of all interior angles in triangle is always 180°, so one angle of equilateral triangle is equal to 60°. Thus,

∠A=∠B=∠C=60°

3 0
4 years ago
1. WHAT DOES IT MEAN TO SOLVE A RIGHT TRIANGLE?
slega [8]
Hello there!

1) Solving a right triangle means finding the values of the unknown {most likely a variable} 
2) The picture is for the Similarity in Right Triangles, I couldn't explain it.
     How you can use Pythagorean Theorem: The formula for that is (a^2<span> + b^</span>2<span> = c^</span>2<span>). The longest side of a triangle is called the hypotenuse, and the other sides are called legs. You usually use Pythagorean Theorem when you are trying to find an angle of a side. A and B in the formula are the legs and C is the hypotenuse, it makes sense because the hypotenuse is the longest side of the triangle, which means that it has a greater angle than the legs. So say you have a triangle with a leg of 5, a leg of 7, and the hypotenuse is unknown. (If you're a visual person, I also drew it on paint and put it in :P) The formula is a^2 + b^2 = c^2. The ^2 is an exponent, which means that we have to multiply the base by itself that many times. For example, if we had 3^4, we'd have to multiply 3   4 times. (3*3*3*3=81) So 5*5=25 and 7*7=49. It would be better it fill in the formula as you go. So now you have (25+49=c^2). You wouldn't multiply c^2, because we don't know the base yet, it's an unknown, so we keep it at that for a while. So now we just continue with the problem which is basically 25+49 which is 74. (74=c^2) But that's not the answer. We have to find the square root of 74 in order to get the answer because we have to multiply with an exponent, the opposite is square rooting which is what we have to do. (((what sucks is that I reached the max of files to enter for you so your just gonna have to read the rest. sorry))) So the square root of 74 is 8.6. And that's your answer. The legs are 5 and 7, and your hypotenuse is 8.6. But what if you need to find one of the legs. The formula would be a= </span>\sqrt{c^2-b ^2}  ( I hope the insert thing works if it doesn't I said a= square root of c^2-b^2)
I hope you can solve that because I have to go to a testing Class Connect, and I don't think I've learned the other questions yet. I'm sorry, and I hope I've helped!!

4 0
4 years ago
Other questions:
  • Mr. John Doe was figuring out his federal income tax his income was $26,800, but he was able to subtract $5500 in deduction he p
    14·1 answer
  • How do you solve this?
    5·1 answer
  • -5 [4-(-3)(2)]
    9·1 answer
  • If AB = 3, AD = 5, and DE = 6, what is the length of BC?<br> BC II DE
    13·2 answers
  • For Each Data Set, Determine the median, the first and third Quartiles, and the interquartile Range.
    12·1 answer
  • Do I have hazel or green eyes? I think they're hazel but I can't tell.
    10·2 answers
  • Gabriel buys some pens for $3.77 and a case for $5.48 how much money does he pay altogether<br><br>​
    11·1 answer
  • Y/9 + 5 = 0 ???????????
    13·1 answer
  • ARIHANNAL
    12·1 answer
  • Question below.............
    9·2 answers
Add answer
Login
Not registered? Fast signup
Signup
Login Signup
Ask question!