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-4
It is: 38+4 = 42
In base 10: 38 Check: 34 + 4 = 38; 38 + 4 = 42 In base 6: 406 Check: 346 +2 = 406; 406 + 2 = 426
3x-7+4 = 42 3x-7 = 38 3x = 45 x=15
x2 + 13x + 4 = (x + 6½ + √38¼)(x + 6½ - √38¼). To find this, we need to find p and q, where p + q = 13, pq = 4. 4 = 42¼ - 38¼ = (6½ + √38¼)(6½ - √38¼); thus, p = (6½ + √38¼), q = (6½ - √38¼).