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MaRussiya [10]
3 years ago
15

Solve -3x2 + 30x - 90 = 0.

Mathematics
1 answer:
FrozenT [24]3 years ago
6 0
-3x^{2}+30x-90=0 \\  \\ x^{2}-10x+30=0 \\  \\ \Delta=(-10)^{2}-4*1*30=100-20=-20 \\  \\  \sqrt{\Delta}= \sqrt{-20}=i \sqrt{20}   =2i \sqrt{5}  \\  \\ x_{1}= \frac{10-2i \sqrt{5} }{2} = 5-i \sqrt{5}   \\  \\ x_{2}= \frac{10+2i \sqrt{5} }{2} = 5+i \sqrt{5}
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