Expand.
If necessary, combine like terms.
(x+5)(x-5)=(x+5)(x−5)=

  x² -25

Step-by-step explanation:

(x +5)(x -5) = x(x -5) +5(x -5) = x² -5x +5x -25 . . . . . 5x terms cancel

= x² -25

This is an example of the factoring of the difference of squares:

  (a+b)(a-b) = a²-b²

5x+40

5(x + 8)

7x - 49

7(x - 7)

18x + 9

9(2x + 1)

15x - 10

5(3x - 2)

step-by-step explanation:

for number one all you have to do is factor 5 out of 5x + 40

for number 2 factor 7 out of 7x - 49

for number three factor 9 out of 18x + 9

for number four factor 5 out of 15x - 10

u = -(6/7)w

step-by-step explanation:

place all values with 'u' on one side of the equation.

4u + 8w = - 3u + 2w

4u + 3u = 2w - 8w

further simplify the equation by solving the addition and subtraction.

7u = - 6w

make 'u' the independent variable by placing its co-efficient on the right-hand side.

u = - (6/7)w