Please help me break it down.
Thank you.
2007-01-21 16:07:30 · 12 answers · asked by Christ' Soldier 2 in Science & Mathematics ➔ Mathematics
Well, your answer is gonna be x = -14. To find this, simply multiply -3 by 10x to get -30x, -3 by -3 to find 9, 10 times 3x to get 30. Then 10 times -3 equals -30 right? So you have -30x + 9 + 30x - 30 = x - 7. -30x and 30x cancel each other out, and 9 plus negative 30 equals -21. Bring your x to the left to get -x. Take our -21 to the right of the equals sign and add to -7, giving you
-14. Thus, x = -14. Did that help? =]
2007-01-21 16:19:21 · answer #1 · answered by mr_4dman 1 · 0⤊ 0⤋
-3(10x - 3) + 10(3x - 3) = x - 7
Multiply through the brackets: a(b+c) = ab + ac
=> -3(10x) + (-3)(-3) + 10(3x) + 10(-3) = x - 7
=> -30x + 9 + 30x - 30 = x - 7
=> (-30x + 30x) + (9 - 30) = x - 7
=> 0 + (-21) = x - 7
=> 7 - 21 = x
=> x = -14.
2007-01-21 16:12:10 · answer #2 · answered by Scarlet Manuka 7 · 0⤊ 0⤋
–3(10x – 3) + 10(3x – 3) = x – 7
-30x+9+30x-30=x-7
-21=x-7
-14=x
2007-01-21 16:11:24 · answer #3 · answered by Rachael 1 · 0⤊ 0⤋
–3(10x – 3) + 10(3x – 3) = x – 7
-30x + 9 + 30x -30 -x +7 = 0
-x-14= 0
-x= 14
x= -14
2007-01-21 16:14:10 · answer #4 · answered by ayie 2 · 0⤊ 0⤋
A little less looking for verboten sites on the internet and some more homework doing during the weekend fella.
Same routine as before, but you have 2 multiplications indicated:
-30x+9 + 30x-30 = x-7
Combine
-21 = x-7
x's on one side, constants on the other
-14 = x
Now do your own work
2007-01-21 16:14:40 · answer #5 · answered by cattbarf 7 · 0⤊ 0⤋
-3(10x - 3) + 10(3x - 3) = x - 7
-30x + 9 + 30x - 30 = x - 7
x - 7 = -21
x = -14
2007-01-21 16:19:02 · answer #6 · answered by Sherman81 6 · 0⤊ 0⤋
take the -3 and multiply it by the 10x and the -3, then multiply the 10 by 3x and -3. then add together your like terms and solve!
2007-01-21 16:11:48 · answer #7 · answered by missknightride 4 · 0⤊ 0⤋
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2016-12-02 21:18:37 · answer #8 · answered by ? 4 · 0⤊ 0⤋
-30x + 9 +30x - 30 = x - 7
[30x cancels out with -30x]
-21=x-7
[add7 on each side]
-14=x
2007-01-21 16:13:42 · answer #9 · answered by Anonymous · 0⤊ 0⤋
-30x+9+30x-30=x-7
-21+7=x
x=-14
2007-01-21 16:13:52 · answer #10 · answered by ? 1 · 0⤊ 0⤋