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2x2 - 30x - 152 = 0 simplify x2 - 15x - 76 = 0 since -76 = -19 x 4 and -19 + 4 = -15, we have (x + 4)(x - 19) = 0 x + 4 = 0 or x - 19 = 0 x = -4 or x = 19
4 x 4.75 = 19
7 + 3 x 4 =7 + 12 = 19
19. 4 x 19 = 76 5 x 19 = 95
19 = 4! - 4 - (4/4) The exclamation sign signifies factorial, or (4 x 3 x 2 x 1).