True: x-3 and -3x are unlike terms., The set of ordered pairs {(0,0),(2,0),(3,0),(10,0)} represents a function., |x2 + 1| = x2 + 1., |x - 3| = |x| + |3|, for all x real and negative., If k = 4, then the equation x2 - k x = -4 has one solution only., False: x2 and 2x, 1 / (x - 9) = 0 for x = 9., |a - b| = b - a if b - a < 0., √(x - 5) 2 = x - 5., (x - 2)(x + 2) = x2 - 4x - 4.,

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