7x - 2y - 8z
2007-10-17 06:52:49 · 13 answers · asked by V.S. 2 in Science & Mathematics ➔ Mathematics
Let ur expression have a variable " A "
thus when u solve the problem u need to enter the values to the assigned variable in this case x, y , z have some values so simplify ur expression by adding the values in place.
7x-2y-8z= A
7 (-2) - 2 (3) - 8 (-4)= A
-14 - (-6) - (-32)= A
-14 + 6 + 32= A
-14 + 38= A
24 = A
therefore ur expression 7x-2y-8z=24
2007-10-17 07:14:40 · answer #1 · answered by kittana 6 · 0⤊ 0⤋
I'd start by changing the subtraction to plus the opposite for example:
7x-2y-8z becomes 7x+-2y+-8z
Then just substitute the values of the variables x, y, and z into the expression:
7(-2)+-2(3)+-8(-4)
= -14+-6+32
= 12
2007-10-17 07:06:22 · answer #2 · answered by Matty B 3 · 0⤊ 2⤋
12
2007-10-17 07:50:54 · answer #3 · answered by Anonymous · 1⤊ 0⤋
substitute the variables with the numbers given.
7(-2)-2(3)-8(-4)
-14 -6 +32
=12
2007-10-17 07:05:26 · answer #4 · answered by Rowin 3 · 0⤊ 2⤋
-14-6+32=12
2007-10-17 07:02:47 · answer #5 · answered by LL 3 · 0⤊ 2⤋
x=-2, y=3, z=-4
7x-2y-8z=??
you need to substitute the given values
7*(-2)-2*(3)-8*(-4)=??
-14-6+32=24
2007-10-17 06:58:12 · answer #6 · answered by Anonymous · 1⤊ 2⤋
7(-2)- 2(3)-8(-4)=
-14+6+32=24
2007-10-17 07:17:49 · answer #7 · answered by Dave aka Spider Monkey 7 · 0⤊ 0⤋
7x-2y-8z=?
7(-2)-2(3)-8(-4)=?
-14-6-(-32)=?
-14-6+32=?
-20+32=?
12=?
7x-2y-8z=12
The answer is 12
2007-10-17 07:03:04 · answer #8 · answered by Aviator 2 · 0⤊ 1⤋
7(-2)-2(3)-8(-4)= 12
2007-10-17 06:59:28 · answer #9 · answered by Anonymous · 0⤊ 1⤋
substitute the value u have in the equation, in the place where x, y & z appears.
7x - 2y - 8z
7*(-2)-2*(3)-8*(-4)
-14-6+32
( as -ve * -ve gives +ve
+ve *-ve gives -ve
-ve *+ve gives -ve
+ve*+ve gives +ve)
-14-6+32
-20+32
12
2007-10-17 07:02:19 · answer #10 · answered by Siva 5 · 0⤊ 1⤋