SOLUTION: Good morning, Quick question about fractions in expressions. The question is as follows: If x=-2/5 and y=5/8 What is: 30x^2y? I believe it should be solved like this:

Algebra ->  Expressions -> SOLUTION: Good morning, Quick question about fractions in expressions. The question is as follows: If x=-2/5 and y=5/8 What is: 30x^2y? I believe it should be solved like this:       Log On


   

Question 1118570: Good morning,
Quick question about fractions in expressions. The question is as follows:
If x=-2/5 and y=5/8
What is: 30x^2y?
I believe it should be solved like this:
30 -(-2/5)^2 x 5/8
which gives and answer of: 299/10
Am I evaluating this correctly?
Thank you!
Found 2 solutions by t0hierry, greenestamps:
Answer by t0hierry(194) About Me  (Show Source):
You can put this solution on YOUR website!
I find
x^2 = 4/25
30 x^2 = 120/25 = 4.8
30 x^2 y = 120/25*5/8 = 4.8*5/8 = 0.6*5 = 3

Answer by greenestamps(13209) About Me  (Show Source):
You can put this solution on YOUR website!


There is no subtraction involved.

When the numbers and variables are written next to each other without symbols between them, it means multiplication. Your expression means (30) times (x^2) times (y):



And, by the way, never use "x" to indicate multiplication -- it looks like the variable x. Use "*", or enclose the expressions in parentheses.