please solve 9th bit
(a) and (d)
please...
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(a+b)(a-b) =a^2 -b^2
1.(x+1/x)(x-1/x)
(x) ^2 -(1/x)^2
x^2 -1/x^2
d.
(5/7a^2 +2)(5/7a^2 -2)
(5/7 a^2)^2 -(2)^2
25/49 a^2 -4 is answer
1.(x+1/x)(x-1/x)
(x) ^2 -(1/x)^2
x^2 -1/x^2
d.
(5/7a^2 +2)(5/7a^2 -2)
(5/7 a^2)^2 -(2)^2
25/49 a^2 -4 is answer
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