Question

Dari gambar tsb, bgmna cara mendapatkan hasil "x=3 atau x=-10"??

Answer 1

A=1, b=7, c= -30
D=49-4×1×(-30)=169
x₁= (-b + √D ) / 2a = (-7+√169) / 2(1) = (-7+13) /2 = 6/2 = 3
x₂= (-b - √D ) / 2a = (-7-√169) / 2(1) = (-7-13) /2 = -20/2 = -10