MATH 110 Quiz: MATH 110 NIU Quiz3Solution
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3 + 3x + 1 = x: (1. 4 p123 #25; 5 points) circle the correct answer (2 pts) and show your work (3 pts). Find the real solutions: (a) x = 1 or x = 8 (b) x = 1 or x = 8. Check: for x = 8, we have 3+ 3 8 + 1 = 3+ 25 = 3+5 = 8. 3x + 1 = (x 3)2 = x2 6x + 9 (c) x = 8 (d) x = 8. 0 = x2 9x + 8 for x = 1, we have 3+ 3 1 + 1 = 3+ 4 = 3+2 6= 1. 0 = (x 8)(x 1) x = 8 or x = 1. [ 7: (1. 5 p130 example 9; 5 points) circle the correct answer (2 pts) and show your work (3 pts). 1 < x < 1 (d) none of these.
