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pshichka [43]
3 years ago
13

State the intervals for which the given quadratic is positive and when it is negative.

Mathematics
1 answer:
goblinko [34]3 years ago
3 0

Answer:

  • Positive at (-9, 2)
  • Negative at ( -oo, -9) or (2, + oo)

Step-by-step explanation:

<u>Given function</u>

  • y= -2x^2 - 14x + 36

<u>Getting zero's</u>

  • -2x^2 - 14x + 36 = 0
  • x^2 + 7x - 18 = 0
  • x = ( -7 ± √(49 +72))/2 = ( -7 ± 11)/2
  • x = - 9 and x = 2

<u>As the x^2 has negative coefficient, the function is positive between -9 and 2</u>

  • - 9 < x < 2 or
  • (-9, 2)

<u>And it is negative at:</u>

  • x < -9 and
  • x > 2
  • or
  • ( -oo, -9) or (2, + oo)

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2 years ago
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Someone pls help me.
nydimaria [60]
I’m here to help.
For this question here you need to use the sine formula for the area of a triangle and figure out the area of the sector

I’ll take you through it step-by-step

Area of the arc:

We only have 68.9 degrees out of 360 and we need to use the formula for the area of a circle.
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68.9/360 x pi x 86.1184= 51.78 (2dp)

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As you can see we have no height so we must use the sine formula for the area of a triangle.
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Hope this helped!
3 0
3 years ago
Which letters have more than one line of symmetry?
klemol [59]
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3 0
3 years ago
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If 3x = -36 then x = ?
Vanyuwa [196]

3x=-36|:3\\x=-12

/\/\/\/\/\/\/\/\/\/\/\/\/\/\/\/\/\/\

P.S. Hello from Russia :^)

\/\/\/\/\/\/\/\/\/\/\/\/\/\/\/\/\/\/

3 0
3 years ago
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Viefleur [7K]

The cost will be <u>$20.40</u>

<h3>EXPLANATION</h3>

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Hope this helps!

8 0
3 years ago
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