All categories

2 years ago

2x2 + 2x - 1 when x = -3

Mathematics

2 answers:

myrzilka [38]2 years ago

4 0

2x2+2x-1=
4+2(-3)-1=
4+(-6)-1=
4+(-7)=
-3

Elina [12.6K]2 years ago

4 0

Answer: 11

Concept:

Here, we need to understand the idea of evaluation.

When encountering questions that gave you an expression with variables, then stated: "If x = a, y = b, z = c" (a, b, c are all constants), this means you should substitute the value given for each variable back to the expression.

Solve:

Given information

x = -3

Given expression

2x² + 2x - 1

Substitute values into the expression

=2(-3)² + 2(-3) - 1

Simplify exponents

=2(9) + 2(-3) - 1

Simplify by multiplication

=18 - 6 - 1

Simplify by subtraction

=12 - 1

= $\boxed{11}$

Hope this helps!! :)

Please let me know if you have any questions

You might be interested in

Which of the following choices is the y-intercept of the equation –3x – 2y = 10?

Mekhanik [1.2K]

-3x-2y=10
-2y=3x+10
y=-3/2x -5
If you put x as a value of 0 you will get that the y-intercept will end up being -5

8 0

3 years ago

The original price of a video game is $32.99 before tax. When Mario bought the video game it rang up as $26.39 before tax. He th

mihalych1998 [28]

Answer:

Part A: The percent discount on game is 20%.

Part B: Mario paid a total of $28.50 including sales tax.

Step-by-step explanation:

Given that:

Part A:

Original price of video game = $32.99

Discounted price = $26.39

Amount of discount = 32.99 - 26.39 = $6.60

Discount percent = $\frac{Amount\ of\ discount}{Original\ price}*100$

Discount percent = $\frac{6.60}{32.99}*100 = 0.20*100$

Discount percent = 20%

Part B:

Sales tax = 8% of discounted price

Amount of sales tax = $\frac{8}{100}*26.39 = 0.08*26.39$

Amount of sales tax = $2.11

Total amount = $26.39 + $ 2.11 = $28.50

Hence,

Part A: The percent discount on game is 20%.

Part B: Mario paid a total of $28.50 including sales tax.

5 0

2 years ago

Solve picture question

Naddik [55]

Answer:

As it ایس the correct answer is 45

7.90

7 0

1 year ago

Read 2 more answers

I need help 3-6 pleasr

Colt1911 [192]

3) Mathematical expression would be:
412 - 65 + 0.50x
Where, x = Number of Texts sent

4) Product means result after multiplication, sum after addition, quotient is the result of division with remainder, and difference is how far two numbers are in their magnitude.
"Per" tells us the magnitude for an Unit value.

5) Associative property = (a+b) + c = a+ (b+c)
Commutative property = a + b = b + a
Distributive Property = a(b+c) = ab+bc

They all have their unique characteristics and can be differentiated on that basis.

6) They all are same.
At the end, without parentheses and in proper symbol, it would be equal to -3/4

Hope this helps!

4 0

3 years ago

SALARY In a recent year, the median salary for an engineer in the United States was $55,000 and the median salary for a computer

dalvyx [7]

Given :

Median salary of engineer , E = $55,000 .

Median salary of computer engineer , C = $52,000 .

To Find :

The total cost for a business to employ two engineers and three programmers for 1 year .

Solution :

Now , cost of paying two engineers .

$C_e=\$2\times 55000\\\\C_e=\$110000$