anonymous
  • anonymous
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
  • Stacey Warren - Expert brainly.com
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SOLVED
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jamiebookeater
  • jamiebookeater
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anonymous
  • anonymous
@welshfella
welshfella
  • welshfella
note that 16x^2 and 81 are 2 perfect squares so what are the factors of 16x^2 - 81?
welshfella
  • welshfella
this is the difference of 2 squares a^2 - b^2 = (a + b)(a - b)

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More answers

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

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