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NeX [460]
3 years ago
10

Can someone do these three problems for me please <3

Mathematics
2 answers:
VashaNatasha [74]3 years ago
6 0

Answer:

see below

Step-by-step explanation:

4. ( x+3) ( x-5)

FOIL

   x*x - 5x + 3x -15

Combine like terms

  x^2 -2x-15

5.  ( 2x-4) ( 3x-7)

FOIL

  2x*3x  -7*2x  -4*3x +28

6x^2 -14x -12x +28

Combine like terms

6x^2 -26x +28

6.  ( 3x^2 +2x+1) ( x+3)

Distribute

3x^2*x + 3x^2*3  + 2x*x + 2x*3  + x+3

3x^3 +9x^2 +2x^2 +6x+x+3

Combine like terms

3x^3+11x^2+7x+3

yanalaym [24]3 years ago
4 0

Step-by-step explanation:

Hey there!

4. (x+3) (x-5)

Multiply them.

= x(x - 5) + 3(x - 5)

Simplify them to get answer.

=  {x}^{2}  - 5x + 3x - 15

=  {x}^{2}  - 2x - 15

5. (2x-4) (3x-7).

Multiply them and simplify to get answer.

= 2x(3x - 7) - 4(3x - 7)

= 6 {x}^{2}  - 14x - 12x + 28

= 6 {x}^{2}  - 26x + 28

6. (3x^2 +2x +1) (x +3)

Multiply them and simplify them to get answer.

x(3 {x}^{2}  + 2x + 1) + 3(3 {x}^{2}  + 2x + 1)

= 3 {x}^{3}  + 2 {x}^{2}  + x + 9 {x}^{2}  + 6x + 3

= 3 {x}^{3} +  11 {x}^{2}  + 7x + 3

<em><u>Hope it helps</u></em><em><u>.</u></em><em><u>.</u></em>

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