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anonymous
 one year ago
@dumbcow
anonymous
 one year ago
@dumbcow

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dumbcow
 one year ago
Best ResponseYou've already chosen the best response.1do you know pythagorean thm ?

anonymous
 one year ago
Best ResponseYou've already chosen the best response.0Yea, for the most part.

dumbcow
 one year ago
Best ResponseYou've already chosen the best response.1ok dw:1440520824213:dw

anonymous
 one year ago
Best ResponseYou've already chosen the best response.0So I tried subtracting 9^2 by 5^2 and got 56.. I'm not sure what I've done wrong...

dumbcow
 one year ago
Best ResponseYou've already chosen the best response.1no thats right ... 8125 = 56 now you have to take sqrt to solve for x \[x^2 = 56\] \[x = \sqrt{56}\]

anonymous
 one year ago
Best ResponseYou've already chosen the best response.0I got 7.5 and it's not an option...

dumbcow
 one year ago
Best ResponseYou've already chosen the best response.1right be careful, notice the answer choices leave as radical not decimal also we want Area, so we are not done \[Area = 5*x = 5 \sqrt{56}\]

dumbcow
 one year ago
Best ResponseYou've already chosen the best response.1can you simplify the radical by factoring out a perfect square

anonymous
 one year ago
Best ResponseYou've already chosen the best response.0No. I have no clue what that even means o.o (I'm sorry I'm so horrible at this >.<)

dumbcow
 one year ago
Best ResponseYou've already chosen the best response.1thats ok the goal is to get the number inside the radical(sqrt) as small as possible the only way to get rid of sprt is by having a perfect square .... 4,9,16,25... example: \[\sqrt{9} = \sqrt{3^2} = 3\] also you can split up a sqrt into smaller factors example: \[\sqrt{45} = \sqrt{9*5} = \sqrt{9} \sqrt{5} = 3 \sqrt{5}\] notice once you break it into sqrt9 and sqrt5 , you can get rid of sqrt9 because it equals 3

anonymous
 one year ago
Best ResponseYou've already chosen the best response.0so how do I do that with 56... I don't understand

dumbcow
 one year ago
Best ResponseYou've already chosen the best response.1split it up ... like 45 has factors 9 and 5 what are factors of 56 .... try dividing by 4,9,16,25 etc

dumbcow
 one year ago
Best ResponseYou've already chosen the best response.1yes look for perfect squares.... the only one is 4 4 pairs with 14 \[\sqrt{56} = \sqrt{4*14} = \sqrt{4} \sqrt{14}\]

anonymous
 one year ago
Best ResponseYou've already chosen the best response.0..so my answer would be 14?

dumbcow
 one year ago
Best ResponseYou've already chosen the best response.1no dont try to jump ahead and just match a number to one of the answer choices we want AREA of rectangle with sides 5 and sqrt(56) we factored 56 into 4 and 14 \[\sqrt{56} = \sqrt{4} \sqrt{14} = 2 \sqrt{14}\] Last multiply the 2 sides of rectangle to get AREA \[Area = 5 * \sqrt{56} = 5 * 2 \sqrt{14} = 10 \sqrt{14}\]

anonymous
 one year ago
Best ResponseYou've already chosen the best response.0Oh, okay. I think I get it now. Thanks.

dumbcow
 one year ago
Best ResponseYou've already chosen the best response.1yw keep working on simplifying radicals
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