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anonymous
 one year ago
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
anonymous
 one year ago
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

This Question is Closed

welshfella
 one year ago
Best ResponseYou've already chosen the best response.0note that 16x^2 and 81 are 2 perfect squares so what are the factors of 16x^2  81?

welshfella
 one year ago
Best ResponseYou've already chosen the best response.0this is the difference of 2 squares a^2  b^2 = (a + b)(a  b)

anonymous
 one year ago
Best ResponseYou've already chosen the best response.0I do believe the answer is D.

welshfella
 one year ago
Best ResponseYou've already chosen the best response.0try to factor the expression compare 16x^2  81 with a^2  b^2 and plug the values in

welshfella
 one year ago
Best ResponseYou've already chosen the best response.0what are the square roots of 16x^2 and 81?

welshfella
 one year ago
Best ResponseYou've already chosen the best response.0no a and b are the square roots of 16x^2 and 81

anonymous
 one year ago
Best ResponseYou've already chosen the best response.0I think the answer is D. Am i correct?

welshfella
 one year ago
Best ResponseYou've already chosen the best response.0what number multiplied by itself = 81?

anonymous
 one year ago
Best ResponseYou've already chosen the best response.0The answer I belive it is @welshfella make sure I am correct on this lol. B.

anonymous
 one year ago
Best ResponseYou've already chosen the best response.0@welshfella is she correct?

welshfella
 one year ago
Best ResponseYou've already chosen the best response.0no its not d the important thing is you learn how to solve this

welshfella
 one year ago
Best ResponseYou've already chosen the best response.0ok 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?

welshfella
 one year ago
Best ResponseYou've already chosen the best response.0dw:1439660364573:dw

welshfella
 one year ago
Best ResponseYou've already chosen the best response.0now all you need do is find the 2 square roots of 16/81  dont forget thereas a positive and a negative square root

welshfella
 one year ago
Best ResponseYou've already chosen the best response.0now what is the square root of 81 and 16 ?

welshfella
 one year ago
Best ResponseYou've already chosen the best response.02.25 is one square root but what is the other?

welshfella
 one year ago
Best ResponseYou've already chosen the best response.02.225 is square root of 81/16

welshfella
 one year ago
Best ResponseYou've already chosen the best response.0yes but they want the results as a fraction what are they as fractions?

welshfella
 one year ago
Best ResponseYou've already chosen the best response.0dw:1439660690023:dw

welshfella
 one year ago
Best ResponseYou've already chosen the best response.0really  she has left!!

anonymous
 one year ago
Best ResponseYou've already chosen the best response.0Sorry my internet went out :/

welshfella
 one year ago
Best ResponseYou've already chosen the best response.0ok so what are the square roots of 81 and 16 ?
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