2007-07-07 17:29:22 · 7 answers · asked by peaches 1 in Science & Mathematics ➔ Mathematics
(8x-1)(2x+5)
16x^2+40x-2x-5
16x^2+38x-5 - final answer
2007-07-07 17:36:25 · answer #1 · answered by musiclover2008 3 · 0⤊ 0⤋
FOIL stands for First, Outer, Inner, and Last, I will foil the equation and show you how it works.
1. (8x - 1) (2x + 5)
We now multiply the first part in both sets of parenthesis...
2. 8x * 2x = 16x^2
Now we multiply the outer set of numbers...
3. 8x * 5 = 40x
Now we multiply the inner set of numbers...
4. -1 * 2x = -2x
Now we mulitply the last set of numbers...
5. -1 * 5 = -5
So now we have a series of numbers as shown below.
6. 16x^2 + 40x -2x -5
Now we simply have to group all like terms together and figure out what they add up to, so in this case we would figure out what 40x - 2x is equal to.
7. 16x^2 + (40x - 2x) -5
8. 16x^2 + 38x - 5 becomes your final answer since all like terms have been grouped together.
Foiling an equation should produce a result with the basic formula of: ax^2 +/- bx +/- c where a, b, and c are the numbers you get from the multiplication, positive or negative.
2007-07-08 01:08:55 · answer #2 · answered by dkillinx 3 · 0⤊ 0⤋
= 16x^2 + 40x - 2x - 5
= 16x^2 + 38x - 5
2007-07-08 00:31:27 · answer #3 · answered by cheeseballer 3 · 0⤊ 0⤋
16x^2 + 40x -2x -5
=16x^2 +38x -5
2007-07-08 01:08:56 · answer #4 · answered by Sasha 2 · 0⤊ 0⤋
= 16x² + 40x - 2x - 5
= 16x² + 38x - 5
2007-07-08 03:51:38 · answer #5 · answered by Como 7 · 0⤊ 0⤋
16x^2+38x-5
2007-07-08 00:51:56 · answer #6 · answered by Anna G 2 · 0⤊ 0⤋
16x(squared) + 40x - x - 4
2007-07-08 00:33:51 · answer #7 · answered by Anonymous · 0⤊ 0⤋