(48/50)f(x) = 2x² + 3x × 5x²f(3) =
f(x) = 2x² + 3x × 5x²
f(3) = 2(3)² + 3(3) × 5(3)²
f(3) = 2(3 × 3) + (3 × 3) × 5(3 × 3)
f(3) = 2(9) + 9 × 5(9)
f(3) = 18 + 9 × 45
f(3) = 18 + 405
f(3) = 423
Ninmy!
f(x) = 2x² + 3x × 5x²
f(3) = 2.3² + 3.3 + 5.3²
= (2.3.3) + (3.3) + (5.3.3)
= 18 + 9 + 45
= 72