The sum of a number it’s square and its square root is 22 . What is the number

1 answer

Let the number be \( x \). According to the problem, we can set up the equation:

\[ x + x^2 + \sqrt{x} = 22 \]

To solve this equation, we will rearrange it:

\[ x^2 + x + \sqrt{x} - 22 = 0 \]

This is a complicated equation due to the square root term. Let's isolate \( \sqrt{x} \):

\[ \sqrt{x} = 22 - x - x^2 \]

Now we can square both sides to eliminate the square root:

\[ x = (22 - x - x^2)^2 \]

Expanding the right-hand side:

\[ x = (22 - x - x^2)(22 - x - x^2) \] \[ = (22 - x - x^2)^2 \] Expanding further:

\[ (22 - x - x^2)(22 - x - x^2) = 484 - 44x - 44x^2 + x^2 + 2x^3 + x^4 \]

This is pretty complex, so let's check for possible integer solutions. We can try substituting some reasonable values for \( x \) to see if they satisfy the original equation.

Let's test \( x = 9 \):

\[ 9 + 9^2 + \sqrt{9} = 9 + 81 + 3 = 93 \quad \text{(too high)} \]

Now let's try \( x = 4 \):

\[ 4 + 4^2 + \sqrt{4} = 4 + 16 + 2 = 22 \quad \text{(this works!)} \]

Therefore, the number is:

\[ \boxed{4} \]

Similar Questions
    1. answers icon 1 answer
  1. Express in simplest radical form.square root of, 3, x, end square root 3x ​ Answer Multiple Choice Answers square root of, 3,
    1. answers icon 1 answer
  2. Add and Subtract Radicals Quick CheckMath 8 Q2 (Pre-Algebra) / Roots and Irrational Numbers add 2 square root 21 + 3 square root
    1. answers icon 1 answer
  3. Add and Subtract Radicals Quick CheckMath 8 Q2 (Pre-Algebra) / Roots and Irrational Numbers add 3 square root 21 + 7 square root
    1. answers icon 1 answer
more similar questions