Solve: 16x2 − 81 = 0. x = 4, 9 x = −4, −9 x = 9 over 4, x = −9 over 4 x = 81 over 16, x = −81 over 16

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Solve: 16x2 − 81 = 0. x = 4, 9 x = −4, −9 x = 9 over 4, x = −9 over 4 x = 81 over 16, x = −81 over 16

Mathematics
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note that 16x^2 and 81 are 2 perfect squares so what are the factors of 16x^2 - 81?
this is the difference of 2 squares a^2 - b^2 = (a + b)(a - b)

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Other answers:

I do believe the answer is D.
try to factor the expression compare 16x^2 - 81 with a^2 - b^2 and plug the values in
16^12-81^2?
what are the square roots of 16x^2 and 81?
no a and b are the square roots of 16x^2 and 81
I think the answer is D. Am i correct?
no
what number multiplied by itself = 81?
The answer I belive it is @welshfella make sure I am correct on this lol. B.
@welshfella is she correct?
no its not d the important thing is you learn how to solve this
ok
ok lets do it another way 16x^2 - 81 = 0 add 81 to both sides 16x^2 = 81 now divide both sides by 16 what do you get?
I am confused.
|dw:1439660364573:dw|
\[\sqrt{81/16}\]
now all you need do is find the 2 square roots of 16/81 - dont forget therea-s a positive and a negative square root
now what is the square root of 81 and 16 ?
Um 2.25
2.25 is one square root but what is the other?
-2.25
2.225 is square root of 81/16
yes but they want the results as a fraction what are they as fractions?
* 2.25 i meant
|dw:1439660690023:dw|
really - she has left!!
Sorry my internet went out :/
ok so what are the square roots of 81 and 16 ?
9/4?
yes correct :]
also -9/4

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