the square of a positive number is 24 more than 5 times a number. What is the value of the number?
First, let's construct an algebraic equation to formally find the answer:
Let x represent (the value of) the unknown number.
x²= 5x + 24 --- This equation shows that the (positive) number's square equals 24 more than 5 times the number.
Now we can solve for x (the number):
x² = 5x + 24
x² - 5x - 24 = 0
(x + 3)(x - 8) = 0
x = -3, 8
Therefore, this means that x (the number ) can be either -3 OR 8. Both will satisfy the description.
Hope this helps!
Answer: The positive number is \(8\).
Step-by-step explanation: Let, the positive number to find be \(x\). Then, its square will be \(x^{2}\). Sicne \(x^2\) is \(24\) more than \(5x\), so, while forming an algebraic equation from the given information, we will write
\(x^{2} -24=5x\\\Rightarrow x^{2} -5x-24=0\\\Rightarrow x^{2} -8x+3x-24=0\\\Rightarrow x(x-8)+3(x-8)=0\\\Rightarrow (x-8)(x+3)=0,\)
which gives
\(x-8=0\Rightarrow x=8\)
and
\(x+3=0\Rightarrow x=-3.\)
Since the given number is positive, so \(x=-3\) cannot be true. Hence, \(x=8\) is the solution.
Thus, the positive number is \(8\).