Question

Resolver :
1.- (x/2) - (1/4) +2 < x + 3

2.- -1 < 2x - 1 <4

3.-x² + 9x + 18 > 0

4.- [5 - 9x] >7​

Answer 1

Respuesta:

$1 ) -x / 2 - 1 / 4 + 2 < x + 3\\- x / 2 - x = 3 + 1 / 4 - 2\\-3x = - 1.25\\x = - 1.25 / - 3\\x = 0.41666\\\2 ) - 1 < 2x - 1 < 4\\ -2x < 4 + 1 + 1\\2x < 6\\2x = 6\\x = 6 / 2\\x = 3\\\\3 ) x ^ 2 + 9x + 18 < 0\\f ( x ) x^2 = 2x + 9x + 18 > 0\\10x > 18\\x = 18 / 10\\x = 1.8\\\\-5 + 9x > 7\\9x > 7 + 5\\9x = 12\\x = 12 / 9\\x = 1.33333$

Explicación paso a paso: