Question

The sum of a number and its square is 42. Which equation can be used to find the two numbers for which this is true?

x2 + x = 42
x2 + 2x = 42
x2 + x +42=0
x2 + 2x + 42 = 0
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Answer 1

x² + x = 42

Explanation:

Let the number be x then the square of this number is x²

Sum and equate to 42, that is

x² + x = 42