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4 years ago

Given 30+5x 15+10x What is x

Mathematics

1 answer:

Cerrena [4.2K]4 years ago

8 0

<h2>Answer:</h2>

<h2>Step-by-step explanation:</h2>

We have 30 + 5x + 10x

Solution:

30 + 5x + 10x = 0

30 + 15x = 0

Subtracting 30 on both sides

15x = -30

Dividing both sides by 15

x = -30 / 15

x = -2

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3 years ago

Find all zeros of the polynomial P(x) = x3 − 2x2 − 3x + 10. Express any non-real roots in the form a + bi.

Strike441 [17]

Answer:

$x = - 2 \: or \: x = 2 - i \: or \: x = 2 + i$

Step-by-step explanation:

The given equation is

$p(x) = {x}^{3} - 2 {x}^{2} - 3x + 10$

We can see that:

$p( - 2) = {( - 2)}^{3} - 2 {( -2) }^{2} - 3( - 2)+ 10$

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This means x=-2 is a zero of p(x).

From the long division in the attachment,

We can rewrite the polynomial as:

${x}^{3} - 2 {x}^{2} - 3x + 10 = (x + 2)( {x}^{2} - 4x + 5)$

We now find solution to the quadratic part:

${x}^{2} - 4x + 5 = 0$

This is given by:

$x = \frac{ - b \pm \sqrt{ {b}^{2} - 4ac} }{2a}$

We plug in the values to get:

$x = \frac{ - - 4 \pm \sqrt{ {( - 4)}^{2} - 4 \times 1 \times 5} }{2 \times 1}$

$x = \frac{ 4 \pm \sqrt{ 16 - 20} }{2 }$

$x = \frac{ 4 \pm \sqrt{ - 4} }{2 }$

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Therefore all solutions are:

$x = - 2 \: or \: x = 2 - i \: or \: x = 2 + i$

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