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3 years ago

Can someone please help asap? find f(-4) if f(x) = x2 - x

Mathematics

1 answer:

Marianna [84]3 years ago

6 0

Answer:

Step-by-step explanation:

Given function f(x)= $x^{2}-x$

We need to find f(-4) which means we need to find the value of the function when x=-4 .

On substituting x=-4 in the given function:

f(-4)= $-4^{2}-(-4)$

Square of -4 is 16.

Hence, f(-4)= $16+4$

= $20$

Hence the value of the given function f(x)= $x^{2}-x$ when x=-4 is 20.

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Julie is digging a square area in her backyard a for a vegtable garden. If the area is 52 square feet, what is the approximate l

AURORKA [14]

Answer:

The correct option will be: (b) 7 feet.

Step-by-step explanation:

Suppose, the length of the garden is $x$ feet.

As the shape of the garden is like a square, then the area of the garden will be: $(length)^2 = x^2$ feet²

Given that, the area is 52 square feet. So, the equation will be.......

$x^2= 52\\ \\ x=\sqrt{52} = 7.211.... \approx 7$

So, the approximate length of the garden will be 7 feet.

4 0

3 years ago

Help this is due in 1 hour .

olga55 [171]

Answer:

Step-by-step explanation:

just out b i dont have time to explain

4 0

3 years ago

Read 2 more answers

The maximum value of the function: f(x)= -5 x ^2 +30x-200 is?

VARVARA [1.3K]

Answer:

$\displaystyle - 155$

Step-by-step explanation:

we are given a quadratic function

$\displaystyle f(x) = - 5 {x}^{2} + 30x - 200$

we want to figure out the minimum value of the function

to do so we need to figure out the minimum value of x in the case we can consider the following formula:

$\displaystyle x _{ \rm min} = \frac{ - b}{2a}$

the given function is in the standard form i.e

$\displaystyle f(x) = a {x}^{2} + bx + c$

so we acquire:

b=30
a=-5

thus substitute:

$\displaystyle x _{ \rm min} = \frac{ - 30}{2. - 5}$

simplify multiplication:

$\displaystyle x _{ \rm min} = \frac{ - 30}{ - 10}$

simply division:

$\displaystyle x _{ \rm min} = 3$

plug in the value of minimum x to the given function:

$\displaystyle f (3)= - 5 {(3)}^{2} + 30.3 - 200$

simplify square:

$\displaystyle f (3)= - 5 {(9)}^{} + 30.3 - 200$

simplify multiplication:

$\displaystyle f (3)= - 45 + 90- 200$

simplify:

$\displaystyle f (3)= - 155$

hence,

the minimum value of the function is -155

5 0

2 years ago

Javian has a gift card with a $150 balance. He buys several video games that cost $35 each. After the purchases, his gift card b

SIZIF [17.4K]

Answer:

Step-by-step explanation:

150-35x=45

X in this equation would be 3

Take 35x3 and you get 105. Plug this in

150-105=45

hope this helps

5 0

2 years ago

Solve pls brainliest

Anni [7]

I'm just doing this for achievement sorry bro

Step-by-step explanation:

dud

6 0

2 years ago