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mixer [17]
3 years ago
11

Which of the following are solutions to the quadratic equation below? x^2+7x-8=0

Mathematics
1 answer:
Lunna [17]3 years ago
5 0

Answer:

x=1, −8

Step-by-step explanation:

Use the quadratic formula to find the solutions.

(−b±√b²−4(ac))/2a

Substitute the values a=1 , b=7, and c=−8 into the quadratic formula and solve for x.

(−7±√7²−4⋅(1⋅−8))/2⋅1

Simplify. x=(−7±9)/2

The final answer is the combination of both solutions. x=1,−8

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cluponka [151]
Write the equation based on the problem
r stands for the price of a regular ticket, v stands for the price of a VIP ticket.
⇒ 69r + 40v = 12,601
⇒ 80r + 55v = 16,300

Solve  the equation using elimination method.
I'm eliminating v, so I can find the r. We can eliminate v by changing the coefficient of first and second equation into the same number.
69r + 40v = 12,601 (multiply 11)
80r + 55v = 16,300 (multiply 8)
-----------------------------------------
759r + 440v = 138,611
640r + 440v = 130,400
------------------------------ - (substract)
119r             = 8,211
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Subtitute 69 as r to one of the equation and find v
80r + 55v = 16,300
80(69) + 55v = 16,300
5,520 + 55v = 16,300
55v = 10,780
v = 196

So the price of a regular ticket is $69 and the price of a VIP ticket is $196

Find the difference
difference = 196 - 69
difference = 127

The difference is $127

3 0
3 years ago
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We have that
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Answer:

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Answer:

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