1. (x+8) (x-5) = x(x-2)​

Jawaban:

(x + 8)(x – 5) = x(x – 2)

x(x – 5) + 8(x – 5) = x² – 2x

x² – 5x + 8x – 40 = x² – 2x

x² + 3x – 40 = x² – 2x

x² + 3x – 40 – x² + 2x = 0

x² – x² + 3x + 2x – 40 = 0

5x – 40 = 0

5x = 40

x = 40/5

x = 8

Jadi, nilai x yang memenuhi adalah x = 8