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hichkok12 [17]
3 years ago
11

If f(x) = 8x2-5, what is f(-1)

Mathematics
2 answers:
Klio2033 [76]3 years ago
5 0

Step-by-step explanation:

Remember math is a language

f(x) : A function of x where x can be <em>any</em><em> </em>number including a number you choose

when you see f(-1), this tells you what the function is at <em>this</em> given x value. So you substitute - 1 wherever you see x

8(-1)2 - 5

Nikolay [14]3 years ago
4 0

Answer:3

Step-by-step explanation:

Simply plug in -1 for anywhere you see x in the equation so...

8(-1)^2-5

8(1)-5

8-5

3

Hope this helps

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Solve. Use models to help you.
oksian1 [2.3K]

Answer:

3.38

Step-by-step explanation:

x + y + z = 16.9

x = 2y

y = z

y=y

2y (x) + y(y) + y(z) = 16.0

5y = 16.9

y = 3.38

4 0
3 years ago
Given the functions: f(x) = x^2-9 and g(x) = 3 what is (f/g)(x)? A. x-3 B. x-9 C. x+3 D. x+9
uysha [10]

Answer:

f + g)(x) = f (x) + g(x)

= [3x + 2] + [4 – 5x]

= 3x + 2 + 4 – 5x

= 3x – 5x + 2 + 4

= –2x + 6

(f – g)(x) = f (x) – g(x)

= [3x + 2] – [4 – 5x]

= 3x + 2 – 4 + 5x

= 3x + 5x + 2 – 4

= 8x – 2

(f × g)(x) = [f (x)][g(x)]

= (3x + 2)(4 – 5x)

= 12x + 8 – 15x2 – 10x

= –15x2 + 2x + 8

\left(\small{\dfrac{f}{g}}\right)(x) = \small{\dfrac{f(x)}{g(x)}}(

g

f

)(x)=

g(x)

f(x)

= \small{\dfrac{3x+2}{4-5x}}=

4−5x

3x+2

My answer is the neat listing of each of my results, clearly labelled as to which is which.

( f + g ) (x) = –2x + 6

( f – g ) (x) = 8x – 2

( f × g ) (x) = –15x2 + 2x + 8

\mathbf{\color{purple}{ \left(\small{\dfrac{\mathit{f}}{\mathit{g}}}\right)(\mathit{x}) = \small{\dfrac{3\mathit{x} + 2}{4 - 5\mathit{x}}} }}

3 0
3 years ago
How many times does 50 go into 70
elena55 [62]
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Read 2 more answers
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Amanda [17]

Answer:

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Step-by-step explanation:

call the number x, and the other number y, the answer is:

x<1/2(y)

5 0
2 years ago
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11111nata11111 [884]
I would try -50 i really dont get what your asking but i did -10 -40=50
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3 years ago
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