The square of a certain number is 4 less than 4 times that same number. What is the value of the number?

Question

Mathematics

Julianna Hansen

11 September, 07:57

The square of a certain number is 4 less than 4 times that same number. What is the value of the number?

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Answers (1)

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Miss Piggy · Answer 1

2

Step-by-step explanation:

Let the number be n.

Then n^2 = 4n - 4.

Rewriting this in the standard form of a quadratic equation, we get

n^2 - 4n + 4 = 0, or (n - 2) (n - 2) = 0. Only the positive root, n = 2, "works" here.

Check: The square of 2 is = 4 (2) - 4 is TRUE. The number is 2.