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3 years ago

Find the zeros of polynomial function. f(x)=x^2-x-90

1 answer:

7 0

First step is to factor. With a polynomial function in the form ax² + bx + c = f(x), we have to find what factors of term C have a sum of term B.

So with this, we need factors of -90 add up to become -1. Your factors are - 10 and 9.

f(x) = x² + 9x - 10x - 90

Now we group together and pull out GCFs.

f(x) = (x² + 9x) + (10x - 90)

f(x) = x(x² + 9) - 10(x + 9)

f(x) = (x - 10)(x + 9)

Now, set each factor equal to zero.

x - 10 = 0, x + 9 = 0

For the first equation you are going to add 10 to both sides to get x by itself. Subtract 9 from both sides in the second equation for the same reason.

x = 10, x = -9

Your zeros are at x = -9, 10 or at the ordered pairs (-9, 0) and (10, 0).

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*please help me out if you know how to solve, last person I asked just put a random awnser for point, the problem is bellow and

kicyunya [14]

For both of these, we will divide the wanted outcome by the number of possible outcomes. We will end up with a decimal. A decimal multiplied by 100 becomes a percent.

[a] 50%

$\displaystyle \frac{\text{wanted outcomes}}{\text{possible outcomes}} =\frac{\text{student failed}}{\text{Period 2's class}} =\frac{12}{24} =0.5,\:0.5*100=50\%$

[b] 52%

$\displaystyle \frac{\text{wanted outcomes}}{\text{possible outcomes}} =\frac{\text{student failed from Period 3}}{\text{fails from both classes}} =\frac{13}{25} =0.52,$

$\displaystyle 0.52*100=52\%$

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2 years ago

50 POINTS AND BRAINLIEST TO FIRST CORRECT ANSWER

Alenkasestr [34]

Answer:

(-2, -21)

(-1, -24)

x intercepts

(5,0) / (-5,0)

y intercept

(0, -25)

Step-by-step explanation:

sentences:

Looking at the points I chose, you can see that they mostly all include a negative. Knowing two spots on the graph can help us see our x and y intercepts, *insert x and y intercepts*.

3 0

4 years ago

A painter can paint 350 square feet in 1.25 hours. What is the painting rate in square feet per hour?

blsea [12.9K]

Well we know that he can paint 350 square feet in 1.25 hours. To find how much he can paint in 1 hour, we would divide 350 by 1.25. 350 divided by 1.25 = 280, therefore his painting rate is 280 square feet per hour.

7 0

3 years ago

Read 2 more answers

What is 7/4 as a mixed number?

Nimfa-mama [501]

1 3/4 because you have but how many times 4 goes into 7. Then use the difference as the numerator and use 4 as the bottom

4 0

4 years ago

Read 2 more answers

In a right triangle ABC,right angled at B,the ratio of AB to AC is 1:root 2.Find the value of 2tanA/1-tan square A

Helen [10]

Since we know that ratio of AB : AC is 1 : √2, then we can more or less use those values for the sides, check the picture below.

so we're really looking for tan(2A). Let's bear in mind that tan²(θ) is just another way to write [ tan(θ) ]².

$\bf \stackrel{\textit{Double Angle Identities}}{tan(2\theta)=\cfrac{2tan(\theta)}{1-tan^2(\theta)}}\\\\
-------------------------------\\\\
tan(2A)=\cfrac{2tan(A)}{1-tan^2(A)}\implies \cfrac{2\left( \sqrt{2} \right)}{1-(\sqrt{2})^2}\implies \cfrac{2\sqrt{2}}{1-2}\implies -2\sqrt{2}$

8 0

4 years ago