Annisa

(2x + 1)² = x² + (x + 7)²

4x² + 4x + 1 = x² + x² + 14x + 49

4x² + 4x + 1 = 2x² + 14x + 49

4x² – 2x² + 4x – 14x + 1 – 49 = 0

2x² – 10x – 48 = 0

x² – 5x – 24 = 0

(x – 8)(x + 3) = 0

x – 8 = 0

x = 8

x + 3 = 0

x = -3 (tidak memenuhi)

panjang hipotenusa

= 2x + 1

= 2(8) + 1

= 16 + 1

= 17 cm

Jawaban B