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Norma-Jean [14]
3 years ago
12

Which equation determines d, the cost in dollars to clean r rooms?

Mathematics
1 answer:
noname [10]3 years ago
4 0

Answer:

I don't know.

Step-by-step explanation:

need the whole question to answer

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Solve x2 + 4x – 4 = 0
Damm [24]

Answer:

Quadratic Equations! Yes!

Step-by-step explanation:

Now, there are three methods to solving this:

1.Quadratic Formula

2.Factoring

3. Completing the square

Now, Based on the answers, I think it would be better if we used Quadratic Formula, as you cannot get the answer easily with factoring, and I'm a bit rusty on completing the square.

So, Quadratic Formula! To solve it using this method, we have to find x using this: x=\frac{-b+-\sqrt{b^{2} -4ac} }{2a}(the +- before the square root means it could be both positive or negative)

Where a, b are coefficients and c is a term(in a quadratic equation form: ax^{2} +bx+c=0)

So, we just have to input the stuff from our equation into the formula!

x=\frac{-4+-\sqrt{32} }{2}

Now, we can simplify the square root of 32 into 4 times the square root of 2

x=\frac{-4+-4\sqrt{2} }{2}

And, we can divide 2 from it all!

x=-2+-2\sqrt{2}

So, there you have it! The Answer is C, or 3.

Hope this helps!

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3 years ago
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The correct answer would be B.
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