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
asambeis [7]
3 years ago
8

Solve for x 6x^2-5+-21=0

Mathematics
1 answer:
lapo4ka [179]3 years ago
5 0

Answer:

Step-by-step explanation:

I believe your 6x^2-5+-21=0 should be 6x^2 - 5x - 21=0.

Let's use the quadratic formula to solve for x.

Here the coefficients are a = 6, b = -5 and c = -21.  

The discriminant is b^2-4ac, which here is (-5)^2 - 4(6)(-21), or 529.

The square root of 529 is 23.

Thus, the roots (solutions) are:

       -(-5) ± 23            28

x = ----------------- = ------ = 7/3     and     also    x = -3/2

           2(6)              12

You might be interested in
When a number is written in scientific notion, how can you tell right away whether or not it is or than or equal to one?
nikklg [1K]
Well, to know right away whether or not a number is equal to 1, you need to know what 1 is in scientific notation. 1 * 10^0. Easy enough :) To know if the number is greater than one, any positive number multiplied by 10^a number higher than 0 is greater than one. As well as any number greater than one multiplied by 10^0 or a positive number. For numbers less than one, the way to know is if the number is being multiplied by 10 ^ a negative number. I hope this helps :)
8 0
4 years ago
Plsss help me with this mathhhhh!!!!!!!
Dmitriy789 [7]

Answer:

5357.142857

Step-by-step explanation:

4 0
3 years ago
Read 2 more answers
Use the pi key on a scientific or graphing calculator to compute the percent of error of the approximation of pi, 3.14, to the v
Kitty [74]
Percent error is calculated as \frac{approximation-theoretical}{theoretical}*100.
The approximation in this case is 3.14, and the theoretical or actual value is pi.

Using the formula, the percent error will be:
\frac{3.14- \pi }{ \pi }*100 = -0.0507%

4 0
3 years ago
In ΔHIJ, the measure of ∠J=90°, JI = 4, HJ = 3, and IH = 5. What ratio represents the tangent of ∠I?
VMariaS [17]

Answer:

The ratio  \frac{3}{4} represents the tangent of ∠I

Step-by-step explanation:

Let us revise the trigonometry ratio

  • sin Ф =  \frac{opposite}{hypotenuse}
  • cos Ф =  \frac{adjacent}{hypotenuse}
  • tan Ф =  \frac{opposite}{adjacent}

In Δ HIJ

∵ m∠J = 90°

- Hypotenuse is the side which opposite to the right angle

∴ HI is the hypotenuse

∵ HJ = 3 units

∵ IH = 5 units

- Let us use Pythagoras Theorem to find HJ

∵ (HJ)² + (IJ)² = (IH)²

∴ 3² + (IJ)² = 5²

∴ 9 + (IJ)² = 25

- Subtract 9 from both sides

∴ (IJ)² = 16

- take √  for both sides

∴ IJ = 4 units

To find the tangent of ∠I find the opposite and adjacent sides to it

∵ HJ is opposite to ∠I

∵ IJ is adjacent to ∠I

- use the rule of tan above

∴ tan(∠I) = \frac{HJ}{IJ}

∴ tan(∠I) = \frac{3}{4}

The ratio  \frac{3}{4} represents the tangent of ∠I

7 0
3 years ago
Katherine bought 7 yards of streamers, 25 balloons, and five spools of ribbon to use for party decorations. Each spool contained
dangina [55]
521 feet of streamers and ribbon

This is because 7 yards = 21 feet and 500 + 21 is 521. Hope this helped!
3 0
4 years ago
Other questions:
  • What figure is comprised of two rays that share a common endpoint called a vertex?
    7·2 answers
  • This year, Carmen watched 70 movies. She thought that 21 of them were very good. Of the movies she watched, what percentage did
    13·1 answer
  • A pack of cinnamon-scented pencils sells for $5.00. What is the sales tax rate if the total cost of the pencils is $5.40?
    6·1 answer
  • What is the value of c in this linear system? <br> A) 1<br> B) -3<br> C) -1<br> D) 2
    11·1 answer
  • Find the equation of the line. use exact numbers​
    13·1 answer
  • There are 15 pieces of fruit in a bowl and 6 of them are apples? What percentage are apples
    8·1 answer
  • Solve the system of equations:<br><br><br> 6x - 5y = 15<br><br> x = y + 3
    9·1 answer
  • Please help ! The equation is attached in the photo above :)
    10·2 answers
  • Our new training room can seat 150 employees. If 6 tables consisting of 6 chairs are now taken, what percentage of our new facil
    13·2 answers
  • A restaurant patron is making a salad. His salad can consist of just lettuce, or he can add any of the following items: carrots,
    10·1 answer
Add answer
Login
Not registered? Fast signup
Signup
Login Signup
Ask question!