i'm stumped and i need this for my homework which is due tomorrow.
thanks to anyone who answers
2007-10-23 14:08:53 · 8 answers · asked by Anonymous in Science & Mathematics ➔ Mathematics
4x-(2x+3)=7
now use distibutive property
(- or -1*2x and -or -1*3)
4x-2x-3=7
now put together like terms
(4x-2x)
2x-3=7
add 3 from both sides of the equation
(2x-3=7)
( +3+3)
the posotive 3 cancels out negative 3
2x=10
divide both sides by 2
(2x/2 and 10/2)
x=5
2007-10-23 14:18:19 · answer #1 · answered by ????? 1 · 0⤊ 1⤋
4x - (2x + 3) = 7
4x - 2x - 3 = 7
2x = 10
x = 5
Answer: x = 5
Proof (plug x with 5 in the original equation):
4(5) - (2[5] + 3) = 7
20 - (10 + 3) = 7
20 - (13) = 7
20 -13 = 7
2007-10-23 14:13:41 · answer #2 · answered by Jun Agruda 7 · 2⤊ 0⤋
4x-(2x+3)=7
the negative sign before the paranthesis is actually -1...the "1" is "invisible" so distribute the -1 to what's inside the parenthesis...
4x-1(2x+3)=7
4x-2x-3=7
2x-3=7
to get x by itself, do the opposites....add the -3 to both sides then divide both sides by 2
2x=10
x=5
to test that x really =5, plug into original equation
4(5)- (2(5)+3)=7
4(5)-(10+3)=7
4(5)-13=7
20-13=7
7=7
2007-10-23 14:16:39 · answer #3 · answered by justCurious 2 · 0⤊ 1⤋
2x - 3 = 7
2x = 10
x = 5
2007-10-24 06:56:49 · answer #4 · answered by Como 7 · 1⤊ 0⤋
4x - 2x - 3= 7
2x = 10
x = 5
2007-10-23 14:12:04 · answer #5 · answered by Ms. Exxclusive 5 · 0⤊ 0⤋
4x-(2x+3)=7
4x-2x-3=7 because you multiply out the - sign pretending that it is a -1
2x-3=7 add common factors
2x=10 add 3 to both sides
x=5 divide each side by two
and thats your answer! =]
2007-10-23 14:14:02 · answer #6 · answered by sherbert 1 · 0⤊ 0⤋
4x-(2x+3)=7, add 3, 4x-2x=10, 2x=10, x=5
2007-10-23 14:12:35 · answer #7 · answered by archerpro101 3 · 0⤊ 0⤋
4x-(2x+3)=7
4x-2x-3=7
2x-3=7
2x=10
x=5
To check use 5 for x:
4x-(2x+3)=7
4*5-(2*5+3)=7
20-(13)=7
7=7
CORRECT
2007-10-23 14:23:55 · answer #8 · answered by mardix27 3 · 0⤊ 1⤋