Respostas

2014-03-30T15:11:45-03:00
a) x^2 + 7X - 15 < 10
x ^2 + 7x < 10 + 15
x^2 + x < 35/7
x^2 + x < 5

b) 2x^2 + 3x - 20 < 10
2x^2 + 3x < 10 + 20
2x^2 + x < 30/3
x^2 + x < 10/2
x^2 + x < 5