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snow_lady [41]
3 years ago
11

2 y + 7 = 5(x - 3) What is the standard form for this?

Mathematics
2 answers:
lesya [120]3 years ago
4 0

Answer:

y=10/3 i think if that's what youre asking

Step-by-step explanation:

qaws [65]3 years ago
3 0
If you meant y^2 +7=5(x-3) it would be y= (square root) 5x-22
also y=-(square root) 5x-22
If you didn’t mean y^2 ur answer would be 5x-y=22
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Work out the formula of the nth term in the following quadratic sequence:<br> 19, 15, 9, 1...
Butoxors [25]

In a quadratic sequence we'll get a linear first difference and a constant second difference.  Let's verify that.

n          1   2   3   4

f(n)       19  15  9   1

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2nd diff     2   2

We see that we got a constant second difference.  We could just extend that and work back up to get more values.

n          1   2   3   4       5    6      7

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That's just an aside; we're after the general formula.  We have

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f(n) = an²  + bn + c

We get three equations in three unknowns,

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9 = a(3²) + b(3) + c =  9a + 3b + c

That's a 3x3 linear system; it's easy to solve directly.  Subtracting pairs,

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b = -3a -4 = -1

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Answer: f(n) = -n² - n + 21

Check:

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f(2) = -4 - 2 + 21 = 15, good

f(3) = -9 - 3 + 21 = 9, good

f(4) = -16 - 4 + 21 = 1, good

Let's check our extended table, how about

f(7)= -49 - 7 + 21 = -35, good

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