(x + 5) × (5x – 1) = …

(x + 5) × (5x – 1) = …

Cara Penyelesaian

(x+ 5) × (5x – 1) = x(5x – 1) + 5 (5x – 1)

 = (x(5x) – x(1)) + (5(5x) – 5(1))

 = 5(x)(x) – x + (5)(5)x – 5

 = 5x² – x + 25x – 5

= 5x² + (-x + 25x) – 5

 = 5x² + (-1 + 25)x – 5

= 5x² + 24x – 5