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Galina-37 [17]
3 years ago
11

Please help lots of points rewarded

Mathematics
2 answers:
castortr0y [4]3 years ago
8 0

Answer:

  • tₙ =  2n² - 3

Step-by-step explanation:

<u>Standard form of a quadratic equation:</u>

  • y = ax² + bx + c

<u>Apply same for the quadratic sequence:</u>

  • tₙ = an² + bn + c

<u>Substitute n with 1, 2 and 3 to get the system:</u>

  • -1 = a*1² + b*1 + c  ⇒ a + b + c = -1
  • 5 = a*2² + b*2 + c  ⇒ 4a + 2b + c = 5
  • 5 = a*3² + b*3 + c  ⇒ 9a + 3b + c = 15

<u>Subtract the first equation from the second and subtract the second equation from the third to get:</u>

  • 3a + b = 6
  • 5a + b = 10

<u>Again subtract the equations to find a:</u>

  • 2a = 4
  • a = 2

<u>Then find b and c:</u>

  • b = 3a - 6 = 6 - 6 = 0
  • c = -1 - a - b = -1 - 2 - 0 = -3

<u>Substitute the coefficients back into the equation of the quadratic sequence:</u>

  • tₙ = 2n² + 0n + (-3) = 2n² - 3
ololo11 [35]3 years ago
6 0
A of n = 2n^2 - 3
the nth term = 2 times n to the power of 2 minus 3
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3 years ago
Give two points with integer coordinates that have a slope of 5/7 between them.
mel-nik [20]

Answer:

(2,3) and (7,10)

Step-by-step explanation:

Use the slope 5/7 to get to a new point by moving up 5 units and moving to the right 7 units.

4 0
3 years ago
Which of the following is defined by a line parallel to one side of a triangle
Katarina [22]

Answer:

Triangle Proportionality Theorem is  defined by a line parallel to one side of a triangle  divides the other two sides proportionally.

Step-by-step explanation:

Triangular Proportionality Theorem states that:

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Let us consider the triangle ΔABC as shown in attached figure.

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DE║AC

then

\frac{BD}{DA} = \frac{BE}{EC}

Therefore, Triangle Proportionality Theorem is  defined by a line parallel to one side of a triangle  divides the other two sides proportionally.

Keywords: Triangle Proportionality Theorem, triangle, line segment

Learn more about Triangle Proportionality Theorem from brainly.com/question/11827486

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3 0
3 years ago
What is the equation of the line that passes through the point (-6,8) and has a slope of -5/3?
Alexxx [7]

Answer:

y = -5/3 - 8

Step-by-step explanation:

We want to write this in the form y = mx + b.  We need to find the m (slope) and the b (y-intercept) ,  Whew, they already gave us the slope, so we are have way there.  I will plug in the x and y that we are given from the point (-6, 8) to solve for b.

y = mx + b

8 = -5/3(-6) + b  Multiply the fraction by -6

8 = 30/3 + b  I can make 6 a fraction by writing it 6/1 and then just multiply straight across.  A negative times a negative is a positive.

8 = 10 + b   30/3 is equal to 10.  Now subtract 10 from both sides to get b

-8 = b

I can now write the equations since I now know m and b.

y = -5/3 + (-8) which is the same as y = -5/3 - 8.  Adding a negative is the same as subtracting a positive.

7 0
2 years ago
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