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25x^2 - (9 + 30x + 25x^2) > 15
25x^2 - 9 - 30x - 25x^2 > 15
- 9 -30x > 15
-30x > 15 + 9
-30x > 24 /:(-30)
x < -24/30
x < - 4/5
x należy do ( - ∞, - 4/5 )
25x^2 - 9 + 25^2 > 15
50x^2 > 24
x < 0,48 (pod pierwiastkiem)