factors for n²-12n+74
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By using Quadratic formula
= -b±√b^2-4ac\2a
= -(-12)±√(-12)^2-4×1×74\2×1
=12±√144-296\2
12±√152\2
taking positive sign
= 12+√152\2
= 12+12.32\2
= 24.32\2
12.16
Taking Negative sign
= 12-√152\2
= 12-12.32\2
= -0.32\2
0.16