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aleksandr82 [10.1K]
3 years ago
11

Find the solution(s) for x in the equation below.x^2 - 9x + 20 = 0

Mathematics
2 answers:
Allisa [31]3 years ago
8 0

Answer:

x = 4, x = 5

Step-by-step explanation:

Given

x² - 9x + 20 = 0

Consider the factors of the constant term (+ 20) which sum to give the coefficient of the x- term (- 9)

The factors are - 4 and - 5, since

- 4 × - 5 = + 20 and - 4 - 5 = - 9, thus

(x - 4)(x - 5) = 0

Equate each factor to zero and solve for x

x - 4 = 0 ⇒ x = 4

x - 5 = 0 ⇒ x = 5

IceJOKER [234]3 years ago
4 0

Answer:

0

Step-by-step explanation:

Solve the equation x^2-9x+20=0. First, we need to factorise the equation on the left hand side, this can be done by finding two numbers that add together to make the 'b' coefficient (-9) and multiply to make the 'c' coefficient (20). This will give -5 and -4. Therefore, (x-5)(x-4)=0.

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4 years ago
A tire manufacturer has a 60,000 mile warranty for tread life. The company wants to make sure the average tire lasts longer than
aleksandrvk [35]

Answer:

The alternative hypothesis being tested in this example is that the tire life is of more than 60,000 miles, that is:

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Step-by-step explanation:

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A repair bill for your car is $553. The parts cost $265. The labor cost is $48 per hour. Write and solve an equation to find the
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<img src="https://tex.z-dn.net/?f=%5Cfrac%20%7B%20a%20%7D%20%7B%20%28%20a%20-%20b%20%29%20%28%20a%20-%20c%20%29%20%7D%20%2B%20%5
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Answer:

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Step-by-step explanation:

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