Question

Algebra Help Plz Will Fan & Medal ;)

1. Simplify the sum or difference.
sqrt 5 + 6 sqrt 5
A) 6 sqrt 5
B) 30
C) 6 sqrt 10
D) 7 sqrt 5

2. Simplify the sum or difference.
4 sqrt 2 - 7 sqrt 2
A) negative sqrt 6
B) -3 sqrt 2
C) -11 sqrt 2
D) 11 sqrt 2

3. Simplify the sum or difference.
3 sqrt 7 - sqrt 63
A) -2 sqrt 7
B) -6 sqrt 7
C) -4 sqrt 3
D) 0

Answer 1

@jacobciezki

Answer 2

Whatcha got for answers that you've tried? :)

Answer 3

caught in your tracks john HAH math cheater

Answer 4

XDD hey when you need help again I got you @rebeccaxhawaii

Answer 5

ikik im jk thanks

Answer 6

Okay sorry about that @Answers101 haha...didnt mean to spam your question

But yeah, I'm assuming you have tried these, what do you have so far?

Answer 7

@johnweldon1993
1. A
2. C
3. A

Answer 8

2 is good :)

1...not quite...if we have \(\large \sqrt{5} + \sqrt{5}\) what does that equal? \(\large 2\sqrt{5}\) right?

So applying that here...we have \(\large \sqrt{5} + 6\sqrt{5} = 7\sqrt{5}\) right?

Answer 9

It's really confusing to me :(

Answer 10

Okay...well hmm lets try and think about it a little bit before hand

Lets write some general rules

\[\large 1\sqrt{a} + 1\sqrt{a} = 2\sqrt{a}\]
\[\large 2\sqrt{a} + 3\sqrt{a} = 5\sqrt{a}\]


So what do you notice? When the number under the square root sign is the same...we leave it alone and just add the numbers outside together

\[\large 7\sqrt{a} + 10\sqrt{a} = 17\sqrt{a}\]

idk if that helps at all...

Answer 11

what number

Answer 12

You actually already did it for 2)

\[\large 4\sqrt{2} - 7\sqrt{2}\]

since they both have \(\large \sqrt{2}\) we just leave that alone...and worry about the numbers on the outside

\(\large 4\sqrt{2} - 7\sqrt{2} \rightarrow (4 - 7)\sqrt{2}\) which = \(\large -11\sqrt{2}\)