Advanced Math practice question

Answer: 5

x² − x − 20 = (x − 5)(x + 4), so x = 5 or x = −4.

Common wrong answers

If you answered 4

4 gives 16 − 4 − 20 = −8.

If you answered 20

20 is the constant term.

If you answered -4

−4 is the smaller root.

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