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Rama09 [41]
3 years ago
8

Find the polynomial of minimum degree, with real coefficients, zeros at x=4+4i and x=2, and y-intercept at 64

Mathematics
1 answer:
Mice21 [21]3 years ago
8 0

Answer:

\displaystyle -x^3+10x^2-48x+64

Step-by-step explanation:

We want to find the minimum-degree polynomial with real coefficients and zeros at:

x= 4+4i\text{ and }  x = 2

As well as a <em>y-</em>intercept of 64.

By the Complex Root Theorem, if <em>a</em> + <em>b</em>i is a root, then <em>a</em> - <em>b</em>i is also a root.

So, a third root will be 4 - 4i.

The factored form of a polynomial is given by:

P(x)=a(x-p)(x-q)...

Where <em>a</em> is the leading coefficient and <em>p</em> and <em>q</em> are the zeros. More factors can be added if necessary.

Substitute:

P(x)=a(x-(2))(x-(4+4i))(x-(4-4i))

Since we want the minimum degree, we won't need to add any exponents.

Expand the second and third factors:

\displaystyle \begin{aligned} (x-(4+4i))(x-(4-4i))&=(x-4-4i)(x-4+4i) \\ &= x(x-4-4i)-4(x-4-4i)+4i(x-4-4i)\\ &=x^2-4x-4ix-4x+16+16i+4ix-16i-16i^2\\ &= x^2-8x+32\end{aligned}

Hence:

P(x)=a(x-2)(x^2-8x+32)

Lastly, we need to determine <em>a</em>. Since the <em>y-</em>intercept is <em>y</em> = 64, this means that when <em>x</em> = 0, <em>y</em> = 64. Thus:

64=a(0-2)(0^2-8(0)+32)

Solve for <em>a: </em>

-64a=64\Rightarrow a=-1

Our factored polynomial is:

P(x)=-(x-2)(x^2-8x+32)

Finally, expand:

\displaystyle \begin{aligned} P(x) &=-(x^2(x-2)-8x(x-2)+32(x-2)) \\&=-(x^3-2x^2-8x^2+16x+32x-64)\\&=-(x^3-10x^2+48x-64)\\&= -x^3+10x^2-48x+64\end{aligned}

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In 90 minutes the population to grow to 700 organisms.

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A strand of bacteria has a doubling time of 15 minutes.

If the population starts with 10 organisms.

We have to determine,

How long would it take for the population to grow to 700 organisms?

According to the question,

A strand of bacteria has a doubling time of 15 minutes.

If the population starts with 10 organisms.

In 15 minutes strand of bacteria has a doubling time the population starts with 10 organisms.

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In 15 minutes 20 bacteria for the population to grow.

In 30 minutes strand of bacteria has a doubling time the population starts with 20 organisms.

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In 30 minutes 40 bacteria for the population to grow.

In 45 minutes strand of bacteria has a doubling time the population starts with 40 organisms.

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In 45 minutes 80 bacteria for the population to grow.

In 60 minutes strand of bacteria has a doubling time the population starts with 80 organisms.

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In 60 minutes 160 bacteria for the population to grow.

In 75 minutes strand of bacteria has a doubling time the population starts with 160 organisms.

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In 75 minutes 320 bacteria for the population to grow.

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For more details refer to the link given below.

brainly.com/question/3188472

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