The square of 9 less than a number is 3 less than the number. What is the number?

a) - 12 or 7

b) - 12 or - 7

c) - 7 or 12

d) 7 or 12

Question

Kayley Campbell

12 October, 05:16

+2

Answers (1)

Know the Answer?

Esperanza Mann · Answer 1

Let the number be x, then (x - 9) ^2 = x - 3

x^2 - 18x + 81 = x - 3

x^2 - 19x + 84 = 0

(x - 12) (x - 7) = 0

x = 12 or 7

The square of 9 less than a number is 3 less than the number. What is the number?a) - 12 or 7b) - 12 or - 7c) - 7 or 12d) 7 or 12