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3 years ago

For the function f defined by f(x)=3x2−2x+5 find f(−x),−f(x) , and −f(−x).

Mathematics

1 answer:

Brums [2.3K]3 years ago

6 0

Step-by-step explanation:

$f(x)=3x^2-2x+5\\\\f(-x)=\text{substitute (-x) instead x in f(x)}\\\\f(-x)=3(-x)^2-2(-x)+5=3x^2+2x+5\\\\-f(x)=-(3x^2-2x+5)=-3x^2-(-2x)-5=-3x^2+2x-5\\\\-f(-x)=-(3x^2+2x+5)=-3x^2-2x-5$

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3 years ago

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A students' choir contains 25 children and only 5 of them play the piano. If a child is selected at random, what is the probabil

solniwko [45]

Answer:

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$P(E^{-}) =\frac{4}{5}$

Step-by-step explanation:

A students' choir contains 25 children

n(S) =25

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Let 'E' be the event of the child play the piano so n(E) =5

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Let 'E⁻ be the event of the child play does not play the piano

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<u>Conclusion</u>:-

probability that the child DOES NOT play the piano

$P(E^{-}) =\frac{4}{5}$

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3 years ago

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Step-by-step explanation:

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Final Answer: choice C)

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