Question

Will someone please explain this to me? And help me I REALLY don't understand what I'm doing
Evaluate each expression for the given values. Provide answers in simplified radical form and approximate irrational answers to the nearest hundredth.

Answer 1

\[15+2\sqrt{a+8} -\sqrt{3a}\] when a=4

Answer 2

\[2\sqrt{(x+y)-(x-y)^{2}}\] when x=8 and y=5

Answer 3

\[3\sqrt{(ab)^{2}}+(2a+b)^{3}\] when a =1 and b=4

Answer 4

\[15+2\sqrt{a+8} -\sqrt{3a}\] for \(a=4\) start with \[15+2\sqrt{4+8} -\sqrt{3\times 4}\]

Answer 5

there is more work to be done, but what do you get first?

Answer 6

\[17\sqrt{12}-\sqrt{12}\]

Answer 7

hmm no

Answer 8

you can't add them like that,
the first step is \[15+2\sqrt{12}-\sqrt{12}\]

Answer 9

sort of like \[15+2x-x\]
what do you get when you combine like terms there?

Answer 10

15+2x-x
2x

Answer 11

where did the 15 go?

Answer 12

15+2x

Answer 13

ok that is somewhat better but still not right
what is \[2\times 5-5\]?

Answer 14

\[2\times5=10-5=5\]

Answer 15

right
and how about \[2\times 7-7\]?

Answer 16

\[2\times7=14-7=7\]

Answer 17

ok good, so \[2\times 5-5=5\\2\times 7-7=7\\
2\times x-x=?\]

Answer 18

5 and 7 would be the two x's?

Answer 19

yes
just trying to make sense out of \(2x-x\)
for example \(x\) could be an apple
two apples minus one apple is ?

Answer 20

if we had 2-1=1

Answer 21

yes but is it not the number 2-1= 1 it is two apples minus one apple equals one apple \[2\spadesuit -\spadesuit=\spadesuit\]
\[2x-x=?\]

Answer 22

the problem already gives us 2 \[2(2)-1=3?\] is that how we would set it up and solve?

Answer 23

no, we are still at \[15+2\sqrt{12}-\sqrt{12}\]

Answer 24

now the first question is, what is \(2\sqrt{12}-\sqrt{12}\)?

Answer 25

the factors of \[\sqrt{12}\]
would be \[\sqrt{3} and \sqrt{4}\]and 4 can go smaller \[\sqrt{2}\]