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(2ˣ + 2⁻ˣ)² = 5²
(2ˣ)² + 2(2ˣ)((2⁻ˣ) + (2⁻ˣ)² = 25
(2²ˣ) + 2(2⁰) + (2⁻²ˣ) = 25
(2²ˣ) +2(1) + (2⁻²ˣ) = 25
2²ˣ + 2⁻²ˣ + 2 = 25
2²ˣ + 2⁻²ˣ = 25-2
2²ˣ + 2⁻²ˣ = 23