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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)
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
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?
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 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.
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 ?
2.25 is one square root but what is the other?
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
really - she has left!!
Sorry my internet went out :/
ok so what are the square roots of 81 and 16 ?
yes correct :]