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xenn [34]
2 years ago
10

(11x^2+5y^2-8xy)+(x^2-7y^2+4x)

Mathematics
1 answer:
CaHeK987 [17]2 years ago
7 0

Answer:

4x2 - 3xy - 9y2

Step-by-step explanation:

You might be interested in
Which is the equation of a parabola with a directrix at y = −3 and a focus at (5, 3)?
kramer

Answer:

y = 1/12 (x − 5)²

Step-by-step explanation:

We can solve this graphically without doing calculations.

The y component of the focus is y = 3.  Since this is above the directrix, we know this is an upward facing parabola, so it must have a positive coefficient.  That narrows the possible answers to A and C.

The x component of the focus is x = 5.  Since this is above the vertex, we know the x component of the vertex is also x = 5.

So the answer is A. y = 1/12 (x−5)².

But let's say this wasn't a multiple choice question and we needed to do calculations.  The equation of a parabola is:

y = 1/(4p) (x − h)² + k

where (h, k) is the vertex and p is the distance from the vertex to the focus.

The vertex is halfway between the focus and the directrix.  So p is half the difference of the y components:

p = (3 − (-3)) / 2

p = 3

k, the y component of the vertex, is the average:

k = (3 + (-3)) / 2

k = 0

And h, the x component of the vertex, is the same as the focus:

h = 5

So:

y = 1/(4×3) (x − 5)² + 0

y = 1/12 (x − 5)²

3 0
3 years ago
Triangle XYZ has vertexes at X(-4, 5), Y(-3, 5), and Z(-3, 4). Find the measure of angle Y to the nearest degree.
hodyreva [135]
Mark these points on the graph to form a right angled triangle.
Angle Y will be 90 degrees
8 0
3 years ago
A convex hexagon has exterior angles that measure 80, 68, 84, 56, and 40. Which of the following the measure of the 6th exterior
Romashka [77]

Answer:

so add the ones that are given and then subtract from 360 because they must total to 360. so 360-80-68-84-56-40=32 so A

6 0
2 years ago
a bag contains 8 red balls and 6 green balls. michelle randomly draws 3 balls from the bag. she does not replace the balls after
earnstyle [38]

Answer:

Red balls 2/14

Green balls 1/14

Step-by-step explanation:

I hope that helped.

6 0
3 years ago
Solve the system by adding. Drag and drop numbers into the coordinates to complete the ordered pair.
Mademuasel [1]

Answer:

(-3,5)

Step-by-step explanation:

4x + 3y = 3

x − 3y = −18

Solve by addition/Elimination

x = -3

y = 5

So,

The solution of the system is (-3,5).

HELPPP PLZZ (I got you)

<u><em>Ace </em></u>

8 0
2 years ago
Read 2 more answers
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