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3x+15-2x²-10x < 0
-7x+15 - 2x² < 0
-2x²-7x+15 < 0
-2x²-7x+15=0
Δ= (-7)²-4(-2)*15= 49+120 = 169
√Δ=13
x1= -(-7)+13/-4 = 20/-4 = -5
x2 = -(-7)-13/-4 = -6/-4 = 1 i 2/4 = 1 i 1/2
-3x²+8x-4>0
-3x² + 8x - 4 = 0
Δ= 8²-4*(-3)*(-4) = 64 - 48 = 16
√Δ= 4
x1 = -8+4/-9 = -4/-9 = 4/9
x2= -8-4/-9= -12/-9 = 1 i 3/9 = 1 i 1/3