3 years ago

If f(x) = -2x -7 what is f(4) and f(-5)

Mathematics

1 answer:

gayaneshka [121]3 years ago

5 0

Answer:

F(4) = -15

f(-5) = 3

Step-by-step explanation:

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Semenov [28]

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Step-by-step explanation:

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? is 107%

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3 years ago

4) If x-1/x=5, fand the value of x²+ 1/x²

tangare [24]

Given:

$\sf x\ -\ \dfrac{1}{x}\ =\ 5$

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$\sf The\ value\ of\ x^2\ +\ \dfrac{1}{x^2}.$

Answer:

$\sf x\ -\ \dfrac{1}{x}\ =\ 5$

Let's square the above expression.

$\sf \bigg(x\ -\ \dfrac{1}{x}\bigg)^2\ =\ 5^2$

According to the identities, (a - b)² = a² - 2ab + b². Using the same logic for the expression above,

$\sf x^2\ -\ 2\ \times\ x\ \times\ \dfrac{1}{x}\ +\ \dfrac{1}{x^2}\ =\ 25\\\\\\x^2\ -\ 2\ +\ \dfrac{1}{x^2}\ =\ 25\\\\\\x^2\ +\ \dfrac{1}{x^2}\ =\ 25 + 2\\\\\\x^2\ +\ \dfrac{1}{x^2}\ =\ 27$

Therefore, the value of x² + 1/x² is 27.

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3 years ago

Waldo measured the width of a window seat as 4.23 feet, but the actual width was 5 feet. What is the percentage of error in Wald

kirza4 [7]

Answer: d. 15.40%

Step-by-step explanation:

Divide 4.23 by 5 to get the percentage.

Subtract this number (.846) from 1 to get the answer: .154 or 15.40%

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3 years ago

If f(x) = -2x -7 what is f(4) and f(-5)​

If f(x) = -2x -7 what is f(4) and f(-5)