Question

х^2+3х-18=0 ПРАВИЛО ДИСКРИМИНАНТА D=b^2-----------4AC

Answer 1

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Answer 2

x^2+3x-18=0   a=1  b=3 c=-18

D=3^2-4 * 1 * (-18) = 9 + 72=81 = 9^2

x1=(-3+9)/2*1 = 6/2=3
x2=(-3-9)/2*1= -12/2=-6