x²+2x-8=0
a=1 b=2 c= -8
D=b² - 4ac = 2² -4×1×(-8) = 4+32 =36 = 6²
x¹= -b+КОРЕНЬ(D) ÷ 2a = -2 + 6 ÷ 2×1 = 4÷ 2 = 4
x²= -b-КОРЕНЬ(D) ÷2a = -2 -6 ÷2×1 = -8 ÷ 2 = -4
x²+2x-8=0
a=1 b=2 c= -8
D=b² - 4ac = 2² -4×1×(-8) = 4+32 =36 = 6²
x¹= -b+КОРЕНЬ(D) ÷ 2a = -2 + 6 ÷ 2×1 = 4÷ 2 = 4
x²= -b-КОРЕНЬ(D) ÷2a = -2 -6 ÷2×1 = -8 ÷ 2 = -4