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Ber [7]
3 years ago
7

The function f is defined by f(x) x2 -6x +21. What are the solutions of f(x) 0? Show your work.

Mathematics
1 answer:
Xelga [282]3 years ago
6 0

f(x)= x^2 -6x +21

0 =x^2-6x+21

subtract 21 from each side to prepare for completing the square

-21 = x^2 -6x

completing the square (b/2)^2

(-6/2) ^ =3^2 = 9

add 9 to each side

-21 +9 = x^2 - 6x + 9

-21 +9 =(x-3) ^2

-12 = (x-3)^2

take the square root of each side

+- sqrt(-12) = x-3

add 3 to each side, take out the negative inside the square root

3 +- i sqrt(12)=x

simplify the square root  sqrt(12)= sqrt(4)sqrt(3) =2sqrt(3)

3 +- i 2sqrt (3) = x

Answer: 3+2isqrt(3)

            3-2isqrt(3)

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four distinct circles are drawn in a plane. what is the maximum number of points where at least two of the circles intersect?
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90 points where at least two of the circles intersect.

<h3>Define circle.</h3>

A circle is a closed, two-dimensional object where every point in the plane is equally spaced from a central point. The line of reflection symmetry is formed by all lines that traverse the circle. Additionally, every angle has rotational symmetry around the centre.

Given,

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Start with two circles; they can only come together in two places. The third circle contacts each of the previous two circles in two spots each, bringing the total number of intersections up to four with the addition of a third circle. The total number of intersections will rise by another 6 when a fourth circle intersects the first three. And the list goes on.

As a result, we get a recognizable, regular pattern: for each additional circle, there are two more intersections overall than in the circle before it.

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90 points where at least two of the circles intersect.

To learn more about circle, visit:

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