Ответ:
-x2+x+72 = 0 / *(-1)
x2-x-72 = 0
D = b2-4ac = 1-4*1*(-72) = 1-(-288) = 1+288 = 289 = 17
x1 = 1-17/2 = -16/2 = -8
x2 = 1+17/2 = 18/2 = 9
x1 = -8 x2 = 9
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Ответ:
-x2+x+72 = 0 / *(-1)
x2-x-72 = 0
D = b2-4ac = 1-4*1*(-72) = 1-(-288) = 1+288 = 289 = 17
x1 = 1-17/2 = -16/2 = -8
x2 = 1+17/2 = 18/2 = 9
x1 = -8 x2 = 9