SOLUTION: I am doing something wrong. I am missing a step. I know this is probably easy but those are the harder ones for me. I can get some help? Add or subtract as indicated:

Algebra ->  Square-cubic-other-roots -> SOLUTION: I am doing something wrong. I am missing a step. I know this is probably easy but those are the harder ones for me. I can get some help? Add or subtract as indicated:       Log On


   

Question 49906: I am doing something wrong. I am missing a step. I know this is probably easy but those are the harder ones for me. I can get some help?
Add or subtract as indicated:
a. 4√72 - 2√48

b. √75 - √48
Found 2 solutions by Nate, rapaljer:
Answer by Nate(3500) About Me  (Show Source):
You can put this solution on YOUR website!
a.)
4%2Asqrt%2872%29+-+2%2Asqrt%2848%29
4%2Asqrt%282%2A6%2A6%29+-+2%2Asqrt%284%2A4%2A3%29
24%2Asqrt%282%29+-+8%2Asqrt%283%29 Only when you take the square root of the same numbers, you subtract or add them.
b.)
sqrt%2875%29+-+sqrt%2848%29
sqrt%285%2A5%2A3%29+-+sqrt%284%2A4%2A3%29
5%2Asqrt%283%29+-+4%2Asqrt%283%29
sqrt%283%29

Answer by rapaljer(4671) About Me  (Show Source):
You can put this solution on YOUR website!
a. 4√72 - 2√48
4%2A+sqrt%2836%29%2Asqrt%282%29+-+2+%2Asqrt%2816%29%2Asqrt%283%29
4+%2A6%2Asqrt%282%29+-+2+%2A4%2Asqrt%283%29
24%2Asqrt%282%29+-+8%2Asqrt%283%29


b. √75 - √48
sqrt%2825%29%2Asqrt%283%29+-++sqrt%2816%29%2Asqrt%283%29
5%2Asqrt%283%29+-4%2Asqrt%283%29
sqrt%283%29

For more detailed explanations see my Lesson Plan "Adding and Subtracting Square Roots" in Square-cubic-other-roots in Algebra.com. Also, please see my website by clicking on my tutor name.

R^2 at SCC