solve 8x - (5x + 4) = 5 The solution is x = what?
回答 (9)
2008-07-26 5:33 pm
✔ 最佳答案
8x - (5x + 4) = 5(distribute the negative sign)
8x - 5x - 4 = 5
(add 4 to both sides)
8x - 5x = 4 + 5
(combine terms)
3x = 9
(divide both sides by 3)
x= 3
~~~~~~~~~~~~~~~~~~~~~~~
Check solution:
8(3) - (5(3) + 4) = 5
24 - (15 + 4) = 5
24 - 19 = 5
5 = 5 (TRUE)
參考: LZY8
2008-07-27 12:44 am
Remember there is an invisible 1 after the minus sign just before the bracket which means that the content of the bracket must be multiplied by -1
8x -1(5x + 4) = 5
8x -5x - 4 = 5
(now bring all terms involving x together)
3x - 4 = 5
(now bring -4 to the other side of the = sign, changing it to +4)
3x = 5 + 4
(now simplify and solve)
3x = 9
x = 9/3
x = 3
8x -1(5x + 4) = 5
8x -5x - 4 = 5
(now bring all terms involving x together)
3x - 4 = 5
(now bring -4 to the other side of the = sign, changing it to +4)
3x = 5 + 4
(now simplify and solve)
3x = 9
x = 9/3
x = 3
2008-07-27 12:38 am
Im pretty sure you would use the distributive property to remove the brackets so multiply everything inside them by negative one. that leaves: 8x - 5x - 4 = 5
Then simplify by carrying over the four or adding positive four to both sides. 8x - 5x = 9
Then you simplify again. 3x = 9
Then you need to remove the three so you divide both sides by three. AND THAT LEAVES.........
x = 3 ta-da!
Then simplify by carrying over the four or adding positive four to both sides. 8x - 5x = 9
Then you simplify again. 3x = 9
Then you need to remove the three so you divide both sides by three. AND THAT LEAVES.........
x = 3 ta-da!
2008-07-27 12:34 am
8x - (5x + 4) = 5
8x - 5x - 4 = 5
(8x - 5x) = 5 + 4
3x = 9
x = 9/3
x = 3
checking to see if it works by putting the answer back in the original equation
8x - (5x + 4) = 5
8*3 - (5*3 + 4) =5
24 - (15 + 4) = 5
24 - 19 = 5
5 = 5 so it checks out
8x - 5x - 4 = 5
(8x - 5x) = 5 + 4
3x = 9
x = 9/3
x = 3
checking to see if it works by putting the answer back in the original equation
8x - (5x + 4) = 5
8*3 - (5*3 + 4) =5
24 - (15 + 4) = 5
24 - 19 = 5
5 = 5 so it checks out
2008-07-27 1:24 am
8x - (5x + 4) = 5
8x - 5x - 4 = 5
8x - 5x = 5 + 4
3x = 9
x = 9/3
x = 3
8x - 5x - 4 = 5
8x - 5x = 5 + 4
3x = 9
x = 9/3
x = 3
2008-07-27 1:23 am
8x - 5x - 4 = 5
3x = 9
x = 3
3x = 9
x = 3
2008-07-27 12:41 am
8X - 5X = 5+4,so 3X = 9 and X=9/3 = 3
24 - 15 - 4 = 5
24 - 15 - 4 = 5
2008-07-27 12:46 am
8x-5x-4=5
3x=9
x=3
3x=9
x=3
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