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β menjadi B
A²-B² = (A+B)(A-B)
Persamaan x² + 3x + k-13
nilai a =1, b = 3, c = k-13
A+B = -b/a
A-B = -(b²-4ac)/a
A+B = -3
A-B = -{(9 - 4(k-13)}/1 = -(9 - 4k +52) = -9 +4k-52 = 4k - 61
-3 (4k-61) = 21
-12k = 21 - 183
12 k = 162
k = 13.5