3radical 7 - radical 7 = 3 why is this incorrect?

Let x represent , then you can rewrite the expression as 3x - x.

3x - x = 2x.  Now replace "x" with   and you get 2.

The reason 3 is incorrect is because you are supposed to perform the operation (+, -, x, ÷) with the coefficients, not with the variable or radical.

7/10 divided by 4/5 is the equivalent to 7/10 multiplied by 5/4as in if you want to divide a fraction by a fraction you multiply by the reciprocal.therefore the answer is 7/8.  if you wanted to use decimals like emily, you would divide .7 by .8... and get .875 or 7/8.