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Harrizon [31]
3 years ago
14

What is 4,7,12,19,28 in quadratic form

Mathematics
1 answer:
Naddik [55]3 years ago
7 0
Asked and answered elsewhere.
brainly.com/question/9247314

You obviously don't mind using "technology" (Brainly) to answer these questions. A graphing calculator can do quadratic regression on the sequence and tell you its formula.

If you want to do it by hand, you can write the equation
.. y = ax^2 +bx +c
and substitute three of the given points. Then solve the resulting three linear equations for a, b, and c.
.. 4 = a +b +c
.. 7 = 4a +2b +c
.. 12 = 9a +3b +c

Subtracting the first equation from the other two reduces this to
.. 3 = 3a +b
.. 8 = 8a +2b
The latter can be divided by 2, so reduces to
.. 4 = 4a +b
Subtracting the first of the reduced equations from this, you have
.. 1 = a
so
.. 3 = 3*1 +b
.. 0 = b
and
.. 4 = a + b + c = 1 + 0 + c
.. 3 = c

And your equation is
.. y = x^2 +3 . . . . . . as shown previously

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The proportionality constant (y to x) is
NeTakaya

Answer:

the constant of proportionality k is given by k=y/x where y and x are two quantities that are directly proportional to each other. Once you know the constant of proportionality you can find an equation representing the directly proportional relationship between x and y, namely y=kx, with your specific k.

Step-by-step explanation:

5 0
3 years ago
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That’s what I need to know to set it up plzzzzss help
AURORKA [14]
3×(60+7)
(3×30) + (3×7)
90 + 21 = 111
7 0
3 years ago
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Help me, please... Which two numbers on the number line have an absolute value of 2.75? Select the location of both numbers on t
Fofino [41]

Answer:

2.75, and - 2.75

Step-by-step explanation:

Both have an absolute value of 2.75 which is how far away they are from 0.

Hope this helped!

6 0
3 years ago
Please help asap dont want to fail final exam
Alex787 [66]

Answer: C

Step-by-step explanation:

3 0
2 years ago
Solve the system of linear equations by graphing. Round the solution to the nearest tenth as needed.
Paladinen [302]
Y + 2.3 = 0.45x
y = 0.45x - 2.3

-2y = 4.2x - 7.8
-2(0.45x - 2.3) = 4.2x - 7.8
-0.90x + 4.6 = 4.2x - 7.8
-0.90x - 4.2x = -7.8 - 4.6
-5.1x = - 12.4
x = -12.4 / -5.1
x = 2.4

y + 2.3 = 0.45x
y = 0.45(2.4) - 2.3
y = 1.08 - 2.3
y = -1.2

solution is : (2.4, - 1.2)
4 0
3 years ago
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