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AnnyKZ [126]
2 years ago
6

What are the zeros of the parabola whose equation is y = x2 + 8x + 15

Mathematics
1 answer:
Sedbober [7]2 years ago
6 0

9514 1404 393

Answer:

  (1)  -5 and -3

Step-by-step explanation:

Descarte's rule of signs tells you the lack of sign changes among the coefficients means there are <em>no positive real roots</em>. That eliminates all answer choices except the first one.

__

If you want to go to the trouble, you can factor the equation:

  y = (x +3)(x +5)

These factors are zero when x = -5 and x = -3.

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Solve this inequality for x: -46 -8x &gt;22.
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Answer:

Step-by-step explanation:

The key to answering this is to know that the only time you'll change the direction of the sign is when you multiply or divide by a negative number.

-46 - 8x > 22

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-8x > 68

x < 68/-8        (we divided by -8 so the inequality changed direction)

x < -17/2

3 0
3 years ago
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Step-by-step explanation:

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Step-by-step explanation:

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