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3 years ago

Fifteen more than the square of a number is eight times the number.

Mathematics

2 answers:

Alenkasestr [34]3 years ago

4 0

The answer to this question is 79

MaRussiya [10]3 years ago

4 0

Answer: n = 3 or 5

n^2+15=8n

Or,

n2 - 8n + 15 = 0

(n - 3)(n - 5) = 0

So n is 3 or 5.

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Answer:

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Step-by-step explanation:

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3 years ago

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ANTONII [103]

PERFECT application of the general equation of things
that are moving up and down in gravity:

   H(t) = H₀ + v₀t + 1/2 g t²

t = time after the toss
H(t) = height at any time after the toss
H₀ = height from which it's tossed
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g = acceleration of gravity

I'm going to call 'UP' = the positive direction .
So ...

H₀ = +40 ft
v₀ = +54 ft/sec
g = -32 ft/sec²

When the object hits the ground, H(t) = 0 .
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   0 = 40 + 54 t - 16 t²

Let me re-write that for you, to make it a
little easier and more familiar:

      - 16 t² + 54 t + 40 = 0

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Now go to your toolbox, pull out your quadratic formula,
solve that quadratic equation, and you'll get the usual two
solutions.

The positive one is the one you want.

The negative one refers to time before the toss, and may be discarded.

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4 years ago

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Fifteen more than the square of a number is eight times the number.​

Fifteen more than the square of a number is eight times the number.