4t² + 30 > (2t + 5) ² - 15t
4t²+30 > 4t²+20t+25-15t
4t²-4t²-20t+15t > 25 - 30
-5t > -5
t < 1
t e (-беск; 1)
4t² + 30 > (2t + 5) ² - 15t
4t²+30 > 4t²+20t+25-15t
4t²-4t²-20t+15t > 25 - 30
-5t > -5
t < 1
t e (-беск; 1)