13x−1 + 32x+1
33x+1 - 12x−1
33x+1 - 12x−1
13x+1 + 32x−1
Correct answer is D
11x+26x2−x−1 = 11x+2(3x+1)(2x−1)
= A3x+1 + B2x−1
11x + 2 = A(2x - 1) + B(3x + 1)
put x = 12
152=52B
B = 3.
put x = −13
−53=−53A ⟹ A = 1
∴ 11x+26x2−x−1 = 13x+1 + 32x−1
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