Question

3.Решите уравнення: а) 2,6х — 2) 1,8( 4) b) |2х + 1 = 8​

Answer 1

|2x + 4| = 8 \\ 2x + 4 = 8 \\ 2x = 8 - 4 \\ 2x = 4 \\ x = 4 \div 2 \\ x = 2

$2x + 4| = 8 \\ 2x + 4 = 8 \\ 2x = 8 - 4 \\ 2x = 4 \\ x = 4 \div 2 \\ x = 2$

2.6(x - 2) = 1.8(x - 4) \\ 2.6x - 5.2 = 1.8x - 7.2 \\ 2.6x - 1.8x = 5.2 - 7.2 \\ 0.8x = -2 \\ x = - 2 \div 0.8 \\ x = - 2.5 \\

$</p><p>2.6(x - 2) = 1.8(x - 4) \\ 2.6x - 5.2 = 1.8x - 7.2 \\ 2.6x - 1.8x = 5.2 - 7.2 \\ 0.8x = -2 \\ x = - 2 \div 0.8 \\ x = - 2.5$