Question

1 Ejercisio
a) x2 + 5x = –6

b) x2 – 7x = –12

c) x2 – x = 20

d) x2 = 11x – 30

Answer 1

Explicación paso a paso:

a)

$2x + 5x = - 6 \\7x = - 6 \\ x = - \frac{6 }{7}$

$2x - 11x = - 30 \\ - 9x = - 30 \\ x = \frac{30}{?9}$

b)

$- 5x = - 12 \\ x = - \frac{12}{ - 5} \\ x = \frac{12}{5}$

c

$x = 20$

d