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miv72 [106K]
3 years ago
10

What Solution set of the equation 9x^2 +6x = -1

Mathematics
1 answer:
coldgirl [10]3 years ago
7 0

Answer:

x=\{- \frac{1}{3}\}

Step-by-step explanation:

9x^2 +6x = -1 \\  \\ 9x^2 +6x  + 1 = 0\\  \\  {(3x + 1)}^{2}  = 0 \\  \\ 3x + 1 = 0 \\  \\ 3x =  - 1 \\  \\ x =   - \frac{1}{3}\\\\x=\{- \frac{1}{3}\}

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The area of a rectangle is (x3 – 5x2 + 3x – 15), and the width of the rectangle is (x2 + 3). If area = length × width, what is t
lisabon 2012 [21]

Answer:

D

Step-by-step explanation:

The area of a rectangle is given by the formula:

A=lw

So, we are given that the area is:

x^3-5x^2+3x-15

And the width is:

x^2+3

And we want to find the length. To do so, first substitute the expressions into the equation:

x^3-5x^2+3x-15=(x^2+3)l

Thus, to find the length, divide by (x²+3):

l=\frac{x^3-5x^2+3x-15}{x^2+3}

So, factor the numerator:

x^3-5x^2+3x-15

From the first two terms, factor out a x^2.

From the third and fourth terms, factor out a 3:

=x^2(x-5)+3(x-5)

Combine:

=(x^2+3)(x-5)

Putting this back:

l=\frac{(x^2+3)(x-5)}{x^2+3}

Cancel:

l=x-5

And that's our answer :)

I believe it would be D.

4 0
4 years ago
What is the value of (1⅔ - ⅚) ÷ 2 5/12 *
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ANSWER:

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4 0
3 years ago
Which graph does NOT represent y as a function of x?​
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Step-by-step explanation:

3 0
3 years ago
I need help ASAP help me plzzzzzz
anzhelika [568]
The answer is A because you need to find the unit rate of each cost
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Hope this helps:))
4 0
3 years ago
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