Tentukanlah nilai (8x + 5) dari persamaan berikut.

Jawaban:

a. 93

b.199/11

c. -3

Penjelasan dengan langkah-langkah:

a. 2x – 6 = 16

2x = 16 + 6

2x = 22

x = 22/2

x = 11

nilai 8x + 5 = 8(11) + 5

= 88 + 5

= 93

b. 2x – 3 = 3(5 – 3x)

2x – 3 = 15 – 9x

2x + 9x = 15 + 3

11x = 18

x = 18/11

nilai 8x + 5 = 8(18/11) + 5

= 144/11 + 5

= 144/11 + 55/11

= 199/11

c. x² + 2x + 1 = 0

(x + 1)(x + 1) = 0

x + 1 = 0

x = – 1

nilai 8x + 5 = 8(-1) + 5

= -8 + 5

= -3