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stepladder [879]
3 years ago
15

X^2 +18 =15 could anyone help me with this?

Mathematics
2 answers:
stiv31 [10]3 years ago
8 0

Answer:

x = i√3, -i√3

Step-by-step explanation:

Simply take the root of both sides, then solve.

Bess [88]3 years ago
3 0

Answer: x = \sqrt{-3} or x = 3i

Step-by-step explanation:

So first you subtract 18 from both sides to cancel out the 18 on the left side.

x^2 = -3

Then you take the square root of both sides in order to get x alone. Then you get an answer of x = \sqrt{-3} which is an imaginary number and can be written as x = 3i.

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Given that f(x)=2x+2 evaluate f(1)+f(5)
Svetlanka [38]

Answer:

16

Step-by-step explanation:

To solve this, you need to evaluate the function at f(1), which just means that you have to plug in 1 for any x you see in the equation. For example, here f(1) = 2(1) + 2 which simplifies to 4. Next find f(5). By doing the same process you will find that this is 12. The problem asks for f(1) + f(5) so by putting those values in you will get 4+12=16. Hope this helps! :)

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3 years ago
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When a force of 30 N acts on a certain object the acceleration of the object is 5m/s2 if the force is changed to 54 N what will
PtichkaEL [24]

Answer:

The correct answer is 9 m per second^{2}

Step-by-step explanation:

Force is defined by mass of an object times it's acceleration.

Let the mass of the object be m kilograms.

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∴ 30 = m × 5

⇒ m = 6.

If the force is changed to 54 N, let the acceleration of the object be x  m per second^{2}.

∴ 54 = m × x

⇒ x = \frac{54}{6} = 9

Thus when the force is 54 N, the acceleration of the object is 9 m per second^{2}.

6 0
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Andreas93 [3]

Answer:

Understanding zero as a number represented by the symbol 0 enabled mathematicians to have a representation of nothing. Having a digit to represent zero enables mathematics to be more abstract, and allows more complex problems to be solved.

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