It Is:
(x+7)(x-4) = 0
I do belive that we are in triginomerty and we are working on quadratic equations. We didn't get to this part in class, and I have no clue as to how I am suppose to solve this! Please Help!!!
2007-05-27 19:40:22 · 9 answers · asked by Biggz 2 in Science & Mathematics ➔ Mathematics
Solve each parentheses:
x+7=0
x+7-7=0-7
x= -7
x-4=0
x-4+4=0+4
x=4
Then put each of your answers (4 and -7) back into the equation one at a time to check for accuracy.
If x= -7
(-7+7)(-7-4)=?
(0)x(-11)=0 ....correct!
If x=4
(4+7)(4-4)=?
(11)x(0)=0 ....correct!
Therefore the answer to your problem is
x= -7,4
on the source below, go to Example 3, Step 5
2007-05-27 20:06:20 · answer #1 · answered by mrwoxfire 1 · 0⤊ 0⤋
(x + 7)(x - 4) = 0
The equation tells us that the product of (x + 7) and (x - 4) is equal to zero.
Which numbers will give us a product of zero?
Of course, if at least one of them is zero, then the whole product is zero.
This tells us that either (x + 7), or (x - 4) is zero.
In equations,
x + 7 = 0
OR
x - 4 = 0
Solve each equation individually
x = -7
OR
x = 4
Therefore, the solutions are x = -7, or x = 4.
^_^
2007-05-28 04:30:34 · answer #2 · answered by kevin! 5 · 0⤊ 0⤋
x + 7 = 0 or x - 4 = 0
x = - 7, x = 4
2007-05-28 03:22:51 · answer #3 · answered by Como 7 · 0⤊ 0⤋
If two things multiply together to give you zero, either the first thing is zero, the second thing is zero, or they both are.
Thus (x+7) = 0
or (x-4) = 0
x= -7
or
x=4
2007-05-28 02:44:10 · answer #4 · answered by z_o_r_r_o 6 · 0⤊ 0⤋
(x+7)(x-4)=0. This means either (x+7)=0 or (x-4)=0.
x+7=0
x= -7
x-4=0
x=4
Solution set ={4, -7}
2007-05-28 02:55:26 · answer #5 · answered by tta r 1 · 0⤊ 0⤋
If two things multiply together to give you zero, either the first thing is zero, the second thing is zero, or they both are.
Thus (x+7) = 0
or (x-4) = 0
x= -7
or
x=4
2007-05-28 02:57:58 · answer #6 · answered by rana_22_m 2 · 0⤊ 0⤋
use
ab=0 that a=0 or b=0
if [x+7][x-4]=0
then x+7 = 0 or x-4 =0
we get -7 or 4 for answer
2007-05-28 04:00:50 · answer #7 · answered by PaeKm 3 · 0⤊ 0⤋
(x+7)(0) = 0
(x+7)(4-4)=0
therefore, x=4
2007-05-28 03:03:34 · answer #8 · answered by tuckging 2 · 0⤊ 0⤋
Multiplication of two terms can be zero only when one of the terms is zero.
Therefore, either x+7=0, x=-7
or x-4=0, x=4
Therefore, x= -7,4
2007-05-28 02:44:21 · answer #9 · answered by Jain 4 · 0⤊ 0⤋