Question

On the last slide, we ended up with an ERROR message when we tried to take sqrt(- 9) This happened because it is "impossible" to take the square root of a negative number. Think : 3 ^ 2 = 9 and (- 3) ^ 2 = 9 but it is impossible x ^ 2 = - 9 to find a number such that . Examine the picture of the 3 parabolas . Which picture do you think matches the original parabola , x ^ 2 - 5x + 9 ? How many x-intercepts will we see ? No x-intercept One x - intercept Two x-intercepts