All categories

2 years ago

Given the function f(x) = -2x2 + 4x - 7, find f(-4). -55 -7 25

Mathematics

2 answers:

Neko [114]2 years ago

7 0

Answer:

f(-4)= -55

Step-by-step explanation:

We want to find f(x), or y, when x is equal to -4.

Therefore, we can substitute -4 in for x in the function.

f(x) = -2x^2 + 4x - 7

Substitute -4 in for x

f(-4) = -2(-4^2) + 4(-4) - 7

Evaluate the exponent

f(-4)=-2(16)+4(-4)-7

Multiply -2 and 16

f(-4)= -32+4(-4)-7

Multiply 4 and -4

f(-4)=-32-16-7

Subtract

f(-4)=-55

DaniilM [7]2 years ago

6 0

-2(-4)2+4(-4)-7
16-16-7
-7. -7 is correct

You might be interested in

Maddie buys 3 sodas for $2 each. she pays with cash and receives $4 in change. write an equation that can be used to find d, the

Ierofanga [76]

3×2=6+4=d the 3×2 is how much the cost is and 6+4 is 10 so she paid 10 dollars

3 0

3 years ago

Davinder earns 4.5% interest per year on the money she has saved in her bank account. She starts off with £200. How much is in h

Mariulka [41]

Answer:

249.24

Step-by-step explanation:

Year Interest Total

Interest Balance

0 -- -- £200.00

1 £9.19 £9.19 £209.19

2 £9.61 £18.80 £218.80

3 £10.05 £28.85 £228.85

4 £10.51 £39.36 £239.36

5 £11.00 £50.36 £250.36

7 0

2 years ago

If the point on the graph is below the origin, x coordinates must be negative.

mariarad [96]

Answer:

true

Step-by-step explanation:

if the point if below or to the left of the origin, it is negative. if it is above or to the right of the origin, it is positive

8 0

3 years ago

Adrian earns $3600 per month. he spends 1/4 of his income on rent, 2/5 on food, 1/9 on activities, and he saves the rest. how mu

murzikaleks [220]

he saves $860 per month

calculate each of his outgoings

rent = $\frac{1}{4}$ × $3600 = $\frac{3600}{4}$ = $900

food = $\frac{2}{5}$ × $3600 = $\frac{2(3600)}{5}$ = $1440

activities = $\frac{1}{9}$ × $3600 = $\frac{3600}{9}$ = $400

savings = $3600 - ( 900 + 1440 + 400 ) = $860

4 0

2 years ago

Read 2 more answers

Solve the equation. show all work.<br><br> 3x - 10 = 5x + 22

inysia [295]

<span>Simplifying 3x + 10 = 5x + 22 Reorder the terms: 10 + 3x = 5x + 22 Reorder the terms: 10 + 3x = 22 + 5x Solving 10 + 3x = 22 + 5x Solving for variable 'x'. Move all terms containing x to the left, all other terms to the right. Add '-5x' to each side of the equation. 10 + 3x + -5x = 22 + 5x + -5x Combine like terms: 3x + -5x = -2x 10 + -2x = 22 + 5x + -5x Combine like terms: 5x + -5x = 0 10 + -2x = 22 + 0 10 + -2x = 22 Add '-10' to each side of the equation. 10 + -10 + -2x = 22 + -10 Combine like terms: 10 + -10 = 0 0 + -2x = 22 + -10 -2x = 22 + -10 Combine like terms: 22 + -10 = 12 -2x = 12 Divide each side by '-2'. x = -6 Simplifying x = -6</span>

5 0

3 years ago