3 years ago

What is the value of the expression 2x2 3xy – 4y2when x = 2 and y = –4? a. –80 b. –32 c. 32 d. 80

Mathematics

1 answer:

FinnZ [79.3K]3 years ago

6 0

2x^2 + 3xy - 4y^2 when x = 2 and y = -4
= 2(2)^2 + 3(2)(-4) - 4(-4)^2 = 2(4) + (-24) - 4(16) = 8 - 24 - 64 = -80

You might be interested in

Which quadratic function in vertex form can be represented by the graph that has a vertex at (3, -7) and passes through the poin

mrs_skeptik [129]

The equation is y=-3/4(x-3)^2-7

6 0

3 years ago

how many pounds of coffee worth $10 a pound should be added to 20 pounds of coffee worth $4 a pound to get a mixture worth $5 a

Solnce55 [7]

Answer:

Step-by-step explanation:

1. if the mass of coffee worth $10 is 'x', then its worth is 10x, and the worth of the mixture is 5(x+20);

2. using the previous item it is possible to write the next equation:

5(x+20)=4*20+10*x; ⇒ x=4.

3. the required mass is 4 pounds.

5 0

3 years ago

Pls help this question i want its aregent

meriva

Step-by-step explanation:

Answer 3

multiply 4 by -20

1/4×-20

= -20/-20

= 1 answer

4 0

3 years ago

Wang Yong owes the bank $8500. To repay the debt, he paid a fixed amount back to the bank each month. After 12 months, his remai

-Dominant- [34]

Answer:

"How much did Wang Yong pay each month" answer: $170

"How long did it take Wang Yong to pay back his entire debt?" answer: 50 months

5 0

3 years ago

On a factory floor, 65 out of every 140 toy robots is defective. What percent of the toy robots are defective? Round your answer

tester [92]

Answer:

65/140

as a percentage is 46.43

hundredth rounding

46.4

Step-by-step explanation:

8 0

3 years ago