Question

A positive number is multiplied by itself and then 7 is added. The answer is 16. What is the number?

a. 4
b. 7
c. 3
d. 6

PLEASE ANSWER QUICKLY (:

Answer 1

c

Explanation:

let the number be n then multiplied by itself gives n², thus

n² + 7 = 16 ( subtract 7 from both sides )

n² = 9 ( take the square root of both sides )

n =
`√(9)` = 3