a) If 2x + 1 = 8. Find the value of 9x2 + 1 3x 4x2
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Ans must be 141. Let 2x=a and 1/3x=b. In the given eqn divide both sides by (ab). In doing so on LHS you will get 1/a+1/b=8/(ab).On further simplication, 3x+1/2x=12. Now square both sides. We get, (9x^2)+(1/4x^2)+3=144 =>Ans is 141
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