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Xelga [282]
3 years ago
7

What is the value of the expression 2x2+3xy-y2, when x=2 And y=-4

Mathematics
1 answer:
Otrada [13]3 years ago
7 0
Plug in 2 for x, and -4 for y

2(2)² + 3(2)(-4) - (-4)²

2² = 4(2) = 8
3(2) = 6(-4) = -24
-4² = 16

8 - 24 - 16 = answer

Simplify.

answer = 8 - 40
answer = -32

-32 is your answer

hope this helps
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Find the inequality represented by the graph.
Mkey [24]

Answer:

y > 4x - 2

Step-by-step explanation:

y-intercept is at -2

slope is rise by 4, run by 1

if you don't know where to shade, select a point and plug it in to see if T or F

example (0, 0)

is 0 > 4(0) - 2

is 0 > -2  True, so shade to the left because this is where (0,0) is

3 0
2 years ago
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Cheryl wants to have $2300 in spending money to take on a trip to Disney World in three years. How much must she deposit now in
Savatey [412]

Use the compound amount formula:

$2,300 = P(1+0.02)^3.  Solve this for P:

P = $2,300 / (1.02)^3 =  $2167.34.

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4 0
3 years ago
What is the distance between points N and M?
Ira Lisetskai [31]

Answer:

B. 5.8

Step-by-step explanation:

When you do the Pythagorean theorem, you would set 5 as a and 3 as b.

Square both sides and add to get 34

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4 0
2 years ago
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What is the solution to this problem (1,3)(5,k) m=2
Mazyrski [523]

Answer:

The solution of given problem is k = 11

Step-by-step explanation:

<u>slope of given two points formula:-</u>

slope m = \frac{y_{2}- y_{1}  }{x_{2}-x_{1}  } .....(1)

Given points are (1,3) and (5,k)

given slope m = 2

now substituting m =2 and the given points are (1,3) and (5,k)

2 = \frac{k-3}{5-1}

on simplification we get solution

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7 0
3 years ago
What is the sum of the first six terms of the geometric series? 2 – 6 18 – 54 ...
Law Incorporation [45]

The sum of the first six terms of the geometric series is -364.

A geometric series is a sequence of terms in a fixed common ratio.

Apparently, the expression "geometric progression" comes from the "geometric mean" (Euclidean term) of segments of lengths a and b: it is the length of the side c of a square whose area is equal to the area of ​​the rectangle. a and b. May

The series given is

2 – 6 + 18 – 54 + ...

The sum of n terms of a geometric series is given by

Sn=a1 * 1 - rn/1 - r

here the first term is 2

r = -6 /2 = -3

S = 2 (1-(-3)⁶)/(1-(-3))

S = -364

Therefore the sum of the First six terms of the geometric series is -364 .

Learn more about geometric series here:brainly.com/question/24643676

#SPJ4

6 0
1 year ago
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