You have to distribute it or use FOIL (if u know that method). This is basically factoring.
for instance:
(2x-9)×(x+4)
first: 2x × x = 2x^2
second: 2x × 4 = 8x
third: -9 × x = -9x
forth: -9 × 4 = -36

now combine like terms.
2x^2 + 8x -9x - 36
(8x and -9x are like terms)
(add the two together, which is -1x or -x)
2x^2 -x -36 is ur answer

now do this same method for the rest

4 0

3 years ago

(-3y3-5y-2)+(-7y2+5y+2)

Slav-nsk [51]

Answer:

=-23y

Step-by-step explanation:

(-3y3-5y-2)+(-7y2+5y+2)

=-3yX3-5y-2-7yX2+5y+2

=-3X3y-5y-7X2y+5y-2+2

=-3X3y-7X2y-2+2

=-9y-7X2y-2+2

=-9y-14y-2+2

=-23y-2+2

=-23y

I hope this helps!

4 0

3 years ago

Read 2 more answers

5x y>_10 x y<_6 x 4y>_12 x>_0 y>_0 minimum for c=10,000x + 20,000y

Serga [27]

We are given inequalities : 5x+y=>10

x+y<=6

x+4y=>12

x=>0

y=>0 .

Let us graph it first and the find the coordinate of the vertices of feasible region.

Coordinates of the feasible region are (1,5) , (1.474, 2.632) and (4,2).

Now, we need to plug those cordinates (1,5) , (1.474, 2.632) and (4,2) in the given function c=10,000x + 20,000y.

Let us plug those points one by one.

For (1,5)

c=10,000x + 20,000y = 10,000(1)+ 20,000(5)= 10,000+ 100,000 = 110,000.

For (1.474, 2.632)

C = 10,000(1.474)+ 20,000(2.632) = 67,380.

For (4,2)

C = 10,000(4)+ 20,000(2) = 80,000.

We got the minimum value 67,380 for (1.474, 2.632) coordinate.

Therefore, minimum for given function C=10,000x + 20,000y is 67,380.

5 0

4 years ago