What is x when 2(x + 5) + 4(2x - 1) = 56?

2010-03-18 10:03 am
I just can't seem to grasp what I'm meant to do!!
Detailed explanation please :)
Thanks to all!

回答 (11)

2010-03-18 10:10 am
✔ 最佳答案
2(x + 5) + 4(2x - 1) = 56 ------------------Given
2x + 10 +8x -4 = 56 -----------------Expand by multiplying the two brackets.
2x + 8x = 56 - 10 + 4 -------------------Rearrange. When a positive number brings over to the other side of '=' sign, it will turn negative and vice versa.

10x = 50
x=5 ------------------------To get x, 10x must be divided by 10 and so 50 must also be divided by 10.
2010-03-18 10:10 am
5
參考: myself
2010-03-18 10:10 am
2x+10+8x-4=56
10x=56-6
10x=50
x=5
2010-03-18 10:09 am
2x+10+8x-4 = 56
10x = 56 - 10+4
10x = 50
x = 5
2010-03-18 10:08 am
u have to expand it.
2x+10 + 8x-4=56
10x+6=56
10x=56-6
10x=50
x=50/10
x=5
參考: my brain.
2010-03-18 10:07 am
2(x + 5) + 4(2x - 1) = 56
--------------------------------------------> 2x + 2x5 + 4x2x - 4x1 = 56
2x + 10 + 8x - 4 = 56
10x + 6 = 56
-------------------------------------------->10x = 56 - 6
10x = 50
x = 5
2016-12-12 9:12 pm
2(3x-4) - 7 = 3x +a million +x first remember PEMDAS:parenthesis, exponents,multiplication,addition, subraction. distribute the two to all the numbers interior the parenthesis. (6x-8) now you have 6x-8 - 7 = 3x +a million +x then, integrate like phrases the region you would be able to (3x +x = 4x) you presently have 6x-8-7 = 4x+a million proceed to integrate like phrases and upload the -7 to the -8 (-8-7= -15) you presently have 6x-15 = 4x +a million Your purpose is to the the x on one edge of the = sign via utilising itself to verify what x equals. you are trying this via utilising doing the alternative of what it says. so which you will SUBTRACT 4x from 6x pondering's a advantageous 4x. (6x-4x=2x) you presently have 2x-15= a million so now you like the x via utilising itself on one edge of the =. so which you will upload 15 to a minimum of a million once you think approximately which you're moving it to distinctive edge of the =. (15+a million=sixteen) you presently have 2x = sixteen. to get the x all via utilising itself, you presently would desire to divide sixteen via utilising 2 which equals 8. so your answer would desire to be x=8 right it extremely is an define of purely the numbers... 2(3x-4) -7 = 3x +a million +x 6x-8 -7 = 3x +a million +x 6x - 15 = 4x +a million 2x - 15 = a million 2x = sixteen x = 8 i be conscious of thats diverse junk, yet its complicated to describe via utilising typing.it would desire to be a lot much less confusing to place in writing it. lol yet im astonishing at math and that i promise it extremely is the respond. if now not, im quite sorry. i labored it out 2 cases to make efficient. want it facilitates!
2010-03-19 8:06 pm
2x + 10 + 8x - 4 = 56

10x = 50

x = 5
2010-03-18 10:12 am
2(x + 5) + 4(2x - 1) = 56
2(x) + 2(5) + 4(2x) - 4(1) = 56
2x + 10 + 8x - 4 = 56
2x + 8x + 10 - 4 = 56
10x + 6 = 56
10x = 56 - 6
x = 50/10
x = 5
2010-03-18 10:10 am
5
2x+10+8x-4=56
10x=56-10+4
so 10x=50
and x=5


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