find a positive number that is 42 less than its square.
Mathematics · Middle School · Tue Nov 03 2020
Answered on
Given:
A positive number that is 42 less than its square.
Find the number.
Solution:
In order to find the number, we can write the equation as,
x = missing number.
x^2 - 42
To find the number, we transpose -42 to the opposite side of the equation, hence it must be taken to note that in transposing a number, the sign changes.
x^2 = 42
Take the square root of both sides in order to determine the value of x.
(x^2)^½ = (42)^½
x = 6.5
Final answer:
The number is 6.5.