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Q.
f(a – 5) = a × 10a : 2 + a² × 6a²
f(10 – 5) = a × 10a : 2 + a² × 6a²
f(5) = 5 × 10(5) : 2 + 5² × 6(5)²
f(5) = 5 × (10 × 5) : 2 + (5 × 5) × 6(5 × 5)
f(5) = 5 × 50 : 2 + 25 × 6(25)
f(5) = 250 : 2 + 25 × 150
f(5) = 125 + 25 × 150
f(5) = 125 + 3.750
f(5) = 3.875
f(a – 5) = a × 10a ÷ 2 + a² × 6a²
f(10 – 5) =
f(5) = 5 × 10(5) ÷ 2 + 5² × 6(5²)
f(5) = 5 × 10(5) ÷ 2 + 5(5) × 6(5)(5)
f(5) = 5 × 10(5) ÷ 2 + 5(5) × 6(25)
f(5) = 5 × 50 ÷ 2 + 25 × 150
f(5) = 250 ÷ 2 + 25 × 150
f(5) = 125 + 25 × 150
f(5) = 125 + 3.750
f(5) = 3.875