Simplify the expression show work. PLease
(x + 5) (x - 7)
2007-04-30 14:38:38 · 6 answers · asked by Veronica P 1 in Science & Mathematics ➔ Mathematics
use the distributive property: a * (x + y) = ax + ay
(x + 5) (x - 7) =
x (x - 7) + 5 (x - 7) =
Note above how we used distributive to break up (x+5). In the next step, we use distributive to eliminate the remaining parentheses. For example, x(x-7) becomes x*x - 7*x, which is x^2 - 7x:
x^2 - 7x + 5x - 35 =
We used distributive twice. Finally we can combine like terms (really using distributive again, though you will skip that step as you become more advanced: -7x + 5x = (-7 + 5)x = -2x):
x^2 - 2x - 35
2007-04-30 14:41:35 · answer #1 · answered by McFate 7 · 0⤊ 0⤋
(x+5)(x-7)
=x(x-7)+5(x-7) by the distributive property
=x^2 - 7x + 5x - 35
=x^2 - 2x - 35
x^2 means x squared.
2007-04-30 21:43:43 · answer #2 · answered by Anonymous · 0⤊ 0⤋
(x+5)(x-7)
u must use 'foil' and multiply all the variables inside the first parentheses w/ the second
x^2-7x+5x-35
combine like terms
x^2-2x-35
2007-04-30 21:43:39 · answer #3 · answered by ~La Prieta~ 2 · 0⤊ 0⤋
(x + 5) (x - 7)=
x^2-2x-35
2007-04-30 21:43:16 · answer #4 · answered by jaybee 4 · 0⤊ 0⤋
x*2 - 2x - 35
2007-04-30 21:47:28 · answer #5 · answered by Anonymous · 0⤊ 0⤋
(x+5)(x-7)
x*x=x^2
5*x=5x
-7*x=-7x
5*-7=-35
x^2+5x-7x-35
x^2-2x-35
2007-04-30 21:43:48 · answer #6 · answered by Dave aka Spider Monkey 7 · 0⤊ 0⤋