Question

multiply and simplify:
(7-radical 3) (9-radical 12)

Answer 1

shadow that isnt right.

Answer 2

oh i thought he was trying to say * not subtract....

Answer 3

63 - 6 -9rad3 -7rad12
= 30 - 9rad3 -14rad3
= 30 - 23rad3

Answer 4

\[(7-\sqrt{3})(9-2\sqrt{3})\] is a start

Answer 5

sorry
its 57 - 23rad3

Answer 6

then do the 4 necessary multiplications and you will get it.

Answer 7

\[7\times 9 -7\times 2\sqrt{3}-9\times \sqrt{3}+2\sqrt{3}\times \sqrt{3}\]

Answer 8

\[7*9-7*\sqrt{12}-\sqrt{3}*9+\sqrt{3}\sqrt{12}=63-7\sqrt{12}-9\sqrt{3}+\sqrt{36}\]
=\[63-7*\sqrt{3*4}-9\sqrt{3}+6=63-6-7\sqrt{4}\sqrt{3}-9\sqrt{3}=57-7*2\sqrt{3}-9\sqrt{3}\]
=\[57-14\sqrt{3}-9\sqrt{3}=57-23\sqrt{3}\]

Answer 9

\[63-14\sqrt{3}-9\sqrt{3}+6\]
\[69-23\sqrt{3}\]

Answer 10

lol

Answer 11

ok i get 69 and not 57 and i am sticking with my answer

Answer 12

I like that much better.

Answer 13

satellite is right

Answer 14

with all gory details worked out, but if any step is not clear let me know

Answer 15

jimmy and i got the same wrong answer lol

Answer 16

yes - its 63 + 6 not 63-6 - satellite is correct

Answer 17

\[\color{pink}{\text{very very sleep....}}\]

Answer 18

yes i probably need sleep

Answer 19

i'm gonna get my hours fix today i will not sleep until 8 pm

Answer 20

then sleep for 24 hours.

Answer 21

i cant

Answer 22

Another concensus!

Answer 23

i got 2 wrong answers - lol!

Answer 24

lol

Answer 25

From Mathematica:\[N\left[\left(7-\sqrt{3}\right)\left(9-\sqrt{12}\right),20\right]=29.162831425915822249 \]\[N\left[69-23 \sqrt{3},20\right]=29.162831425915822249 \]\[N\left[57-23\sqrt{3},20\right]=17.162831425915822249 \]

Answer 26

well whats 12 between friends

Answer 27

yes i already seen my mistake for some reason i did 63-6
when we had 63+6

Answer 28

yeah well i looked at 63 and made it 36 (dyxlexia???}

Answer 29

yes i blame it on that too