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VARVARA [1.3K]
3 years ago
10

Rewrite the equation by completing the square. f (x) = x^2 + 20x - 86

Mathematics
1 answer:
9966 [12]3 years ago
7 0

Answer:

f(x) = (x+10)^2 - 86

Step-by-step explanation:

  1. f(x) = x^2 + 20x - 86
  2. f(x) = x^2 + 20x + 100 - 86 (because (20/2)^2 = 100)
  3. f(x) = (x+10)^2 - 86

Completing the square means you do (b/2)^2 where b is: a^2x + bx + c.

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Describe and correct any error a student may have made when solving the equation
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Answer:

The student made an error during the distributive property in the second step where they multiplied 0.15 by -0.2 to equal -0.3 when it should have been -0.03.

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2 years ago
The diameter of a circle is 6 in. Find its area to the nearest tenth.
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Answer and Step-by-step explanation:

The area formula for a Circle is:

A = \pi r^2

Diameter is equal to the radius times 2.

<u>So, divide the diameter to get the radius.</u>

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A = \pi (3)^{2}

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Plug this into your calculator by multiplying 9 by pi.

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<em><u>#teamtrees #PAW (Plant And Water)</u></em>

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