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polinavakhnina
@polinavakhnina
August 2022
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28x²-5x-30=0
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witch2
Verified answer
28x^2 - 5x - 30 = 0
D = b^2 - 4ac = (-5)^2 - 4*28*(-30) = 25 + 3360 = 3385
VD = V3385
5 + V3385 5 - V3385
x1 = --------------------- = ----------------------------
2*28 56
5 - V3385 5 - V3385
x2 = -------------------------- = -----------------------
2*28 56
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Verified answer
28x^2 - 5x - 30 = 0D = b^2 - 4ac = (-5)^2 - 4*28*(-30) = 25 + 3360 = 3385
VD = V3385
5 + V3385 5 - V3385
x1 = --------------------- = ----------------------------
2*28 56
5 - V3385 5 - V3385
x2 = -------------------------- = -----------------------
2*28 56