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α = 8*10⁻⁶/°C
T₂ = 36°C
A₂ = 1000cm²
A₁ = A₂ - ΔA = 1000 - 0,8 = 999,2 cm²
ΔA = A₁*2α*ΔT
0,8 = 999,2 * 2 * 8*10⁻⁶ * ΔT
ΔT ≈ 50°C
T₂ - T₁ ≈ 50
36 - T₁ = 50
T₁ = 36 - 50 = -14°C