Question

решите уравнения:5х^2+7=3 (2-3х)

Answer 1

5х²+7=3 (2-3х)
5х²+7=6-9х
5х²+7-6+9х=0
5х²+9х+1=0
D=81-4×5×1=√61
x1=-9+√61/2×5 = -9+√61/10
x2=-9-√61/2×5= -9-√61/10