SOLUTION: I have a problem I do not know how to work out. Could someone help me and show me step by step so I can see it please. a^2-40=0 Thank you very much!

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Question 387006: I have a problem I do not know how to work out. Could someone help me and show me step by step so I can see it please.
a^2-40=0
Thank you very much!
Found 2 solutions by stanbon, tara0066:
Answer by stanbon(75887) (Show Source):
You can put this solution on YOUR website!
a^2-40=0
Factor:
(a-sqrt(40))(a+sqrt(40)) = 0
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a = sqrt(40) or a = -sqrt(40)
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a = 2sqrt(10) or a = -2sqrt(10)
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Cheers,
Stan H.
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Answer by tara0066(31) (Show Source):
You can put this solution on YOUR website!
a^2-40=0 First thing you do is add the 40 to both sides
a^2-40(+40)=0+40 This cancels your -40
a^2=40 Next, you will take the square root of both sides. (Square root is the opposite of something that is squared.)This simply removes the ^2 off of your a.
a=Square root of 40
Square root of 40 breaks down to square root of 4 and square root of 10.
The square root of 4 is plus or minus 2.
a=+-2sqrt(10)
When you write it, the plus or minus should go on top of each other with the + on top with the - under it.