(6-5n) ( 6+5n)?

Question

write the product of the sum and difference.
thanx!

Answer 1

Use formula of difference of square
( a - b)(a + b) = a^2 - b^2
(6 - 5n) (6 +5n) = 36 - 25n^2

you can use this also

Apply FOIL Rule
F - stands for first term 6* 6 = 36
O - outer terms 6*5n = 30n
I - Inner terms -5*6n = -30n
L - last terms -5n*5n = -25n^2

so we get 36 + 30n - 30n - 25n^2
36 - 25n^2

Hope this will help you ..

Answer 2

Pay more attention in class! This is basic! The product of this kind of combination is the difference of the two squares, in this case 36 - 25n^2.

Answer 3

a^2 - b^2 = (a+b) (a-b) Use this formula to solve this problem.