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(x +7)(x-3) = 0
x = -7
x = 3
karena x1 > x2 maka x1 = 3 x2 = -7
x1-x2 = 3-(-7)= 10
x²+4x-21=0
(x-3)(x+7)=0
x₁=3
x₂=-7
x₁-x₂=7+3=10