1). Akar (penyelesaian) dari persamaan 9x pangkat 2 – 25 = 0 adalah…

Jawaban:

1. X = -5/3 atau X = 5/3

2.X = -4 atau X = -3

Penjelasan dengan langkah-langkah:

1. 9x² – 25 = 0

(3x + 5) (3x – 5) = 0

= 3x + 5 = 0

= 3x = -5

= x = – 5/3

atau

= 3x – 5 = 0

= 3x = 5

= x = 5/3

2. x² + 7x + 12 = 0

(x + 4) (x + 3) = 0

= x + 4 = 0

= x = -4

atau

= x + 3 = 0

= x = -3