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IrinaK [193]
3 years ago
12

Select the two values of x that are roots of this equation.x + 2x - 6 = 0​

Mathematics
1 answer:
VLD [36.1K]3 years ago
8 0

For this case we must solve the following quadratic equation:

x ^ 2 + 2x-6 = 0

Where:

a = 1\\b = 2\\c = -6

The solution is given by:

x = \frac {-b \pm \sqrt {b ^ 2-4 (a) (c)}} {2a}

Substituting:

x = \frac {-2 \pm \sqrt {2 ^ 2-4 (1) (- 6)}} {2 (1)}\\x = \frac {-2 \pm \sqrt {4 + 24}} {2}\\x = \frac {-2 \pm \sqrt {28}} {2}\\x = \frac {-2 \pm \sqrt {2 ^ 2 * 7}} {2}\\x = \frac {-2 \pm2 \sqrt {7}} {2}\\x = -1 \pm \sqrt {7}

Thus, we have two roots:

x_ {1} = - 1+ \sqrt {7}\\x_ {2} = - 1- \sqrt {7}

ANswer:

x_ {1} = - 1+ \sqrt {7}\\x_ {2} = - 1- \sqrt {7}

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Answer:

$120

Step-by-step explanation:

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The $100 sign up fee is a set amount, or the b value.

The $20 would be the m value since it the constant change, or the slope.

Thus, the equation would be y=20x + 100

The membership fee for 1 month would be --->

y= 20(1) +100

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y= $120

                                     

4 0
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7 0
3 years ago
Music featuring several independent lines is called
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In music, polyphony is a texture consisting of two or more simultaneous lines of independent melody, as opposed to a musical texture with just one voice which is called <u>monophony</u>, and in difference from musical texture with one dominant melodic voice accompanied by chords which is called homophony.

8 0
3 years ago
What is the lmc of 3 and 7
igor_vitrenko [27]

Answer:

21

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7 times 2 is 14 and 3 doesn't go into that!

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Can I have brainliest please, if not that's ok. :)

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Solve this system of equations:<br> y=2x<br> x=-y+6
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Answer:

(2,4)

Step-by-step explanation:

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