what is x in this problem. 3(x + 5) = 4x?
回答 (5)
2008-11-05 2:33 pm
✔ 最佳答案
distribute 3 first3(x + 5) = 4x
3x+15=4x
transpose 3x to the left hand side so that you can isolate x
15=4x-3x
x=15
to check:
substitute the value of x to the original equation
3(15+5)=4(15)
3(20)=60
60=60
hope this helps
2008-11-05 11:16 pm
3(x + 5) = 4x
3*x + 3*5 = 4x
3x + 15 = 4x
3x - 4x = -15
-x = -15
x = -15/-1
x = 15
3*x + 3*5 = 4x
3x + 15 = 4x
3x - 4x = -15
-x = -15
x = -15/-1
x = 15
2008-11-05 10:32 pm
Step 1) 3x+15=4x
step 2) 15=4x-3x
step 3) 15=x
step 2) 15=4x-3x
step 3) 15=x
2008-11-05 10:31 pm
3(x+5)=4x open the brackets by multiplying by 3.
3x+15=4x take "3x" to the other side making it negative.
15=4x-3x subtract.
15=x
x=15
3x+15=4x take "3x" to the other side making it negative.
15=4x-3x subtract.
15=x
x=15
2008-11-05 10:21 pm
3(x+5)=4x
3x+15=4x
3x+15=4x
-3x+15=4x which equals 15= x
Your answer is 15
3x+15=4x
3x+15=4x
-3x+15=4x which equals 15= x
Your answer is 15
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