Answer:
- 2
Step-by-step explanation:
let the number be n then 10 less than the square is n² - 10 and equating
n² - 10 = 3n ( subtract 3n from both sides )
n² - 3n - 10 = 0 ← in standard form
(n - 5)(n + 2) = 0 ← in factored form
Equate each factor to zero and solve for n
n - 5 = 0 ⇒ n = 5
n + 2 = 0 ⇒ n = - 2
The negative solution is - 2
