Practice PLUS Exercises 65–68 describe quadratic equations. Match each description with the graph of the corresponding quadratic function. Each graph is shown in a [-10, 10, 1] by [–10, 10, 1] viewing rectangle. 65. A quadratic equation whose solution set contains imaginary numbers 66. A quadratic equation whose discriminant is 0 67. A quadratic equation whose solution set is {3 ± V2} 68. A quadratic equation whose solution set contains integers а. b. C. d. 69. When the sum of 6 and twice a positive number is subtracted from the square of the number, 0 results. Find the number. 70. When the sum of 1 and twice a negative number is

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A: 105.|x+1|=5x+1=5x=4Again, -x-1=5-6=xThe x values are x=4,-6

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Q: 3 5 3x - 5y = 10 6x+8y=4 -3x - 10y = -30

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Q: 9) -6(5m + 7) – 5(-3 – 5m) = = -2 10) 6(n – 6) – 6(3n – 8) = 12 11) -2(7 – 8x) – 3x = 3(5x – 6) 12)…

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Polynomials

Try substituting 1. You will get 6 and not 0. Try other real values also. What About -2? Let us check.