9. The sum of the square of two consecutive positive integers is 85. Write a quadratic equation.
a. x2 + x - 1 = 85 c. x2 + x - 1 = 85
b. x2 + x + 1 = 85 d. x2 + x + 42 = 0
a. x2 + x - 1 = 85 c. x2 + x - 1 = 85
b. x2 + x + 1 = 85 d. x2 + x + 42 = 0
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