Решите неравенство
д) 4x² -12x + 9 > 0
е) 25x² + 30x + 9 < 0
ж) -10x² + 9x > 0
з) -2x² + 7x < 0
д) 4x² -12x + 9 > 0
е) 25x² + 30x + 9 < 0
ж) -10x² + 9x > 0
з) -2x² + 7x < 0
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Answers & Comments
D= 144-4*4*9=0
e) 25x² + 30x + 9 = 0
D= 900 - 4*25*9=0