Question

a. 9. (x + 5) = 45

b.-56 = 7.(x-4)

C. (2x-3). 4 = 12

d. (15x + 10): 5 = 8

e. (12x - 20): 4 = -2×


plis son ecuaciones, plis con propiedad distributiva.​

Answer 1

Respuesta:

$a)9 \times (x + 5) = 45 \\ 9x + 45 = 45 \\ 9x = 45 - 45 \\ 9x = 0 \\ x = 0$

$b) - 56 = 7 \times (x - 4) \\ - 56 = 7x - 28 \\ - 56 + 28 = 7x \\ - 28 = 7x \\ \frac{ - 28}{7} = x \\ - 4 = x$

$c)(2x - 3) \times 4 = 12 \\ 8x - 12 = 12 \\ 8x = 12 + 12 \\ 8x = 24 \\ x = \frac{24}{8} \\ x = 3$

$d)(15x + 10) \div 5 = 8 \\ 3x + 2 = 8 \\ 3x = 8 - 2 \div 3x = 6 \\ x = \frac{6}{3} \\ x = 2$

$e)(12x - 20) \div 4 = - 2x \\ 3x - 5 = - 2x \\ 3x + 2x = 5 \\ 5x = 5 \\ x = 1$