Logan Lawson
08/19/2024 · Elementary School
Decide what numbers must be added to both sides of the equation to make the left side the sum of a perfect square trinomial in \( x^{2}+24 x+y^{2}-20 y=-4 \) The number 144 should be added to both sides of the equation to make the left side the sum of a perfect square trinomial in \( x \). (Simplify your answer.) The number \( \square \) should be added to both sides of the equation to make the left side the sum of a perfect square trinomial in \( y \). (Simplify your answer.)
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Step-by-step Solution
To transform the left side of the equation \( x^{2} + 24x + y^{2} - 20y = -4 \) into the sum of perfect square trinomials, we need to complete the square for both the \( x \) and \( y \) terms.
### Completing the square for \( x \):
The expression involving \( x \) is \( x^{2} + 24x \).
1. Take half of the coefficient of \( x \) (which is 24), square it:
\[
\left(\frac{24}{2}\right)^{2} = 12^{2} = 144
\]
2. We need to add 144 to both sides of the equation.
### Completing the square for \( y \):
The expression involving \( y \) is \( y^{2} - 20y \).
1. Take half of the coefficient of \( y \) (which is -20), square it:
\[
\left(\frac{-20}{2}\right)^{2} = (-10)^{2} = 100
\]
2. We need to add 100 to both sides of the equation.
### Summary:
- The number \( 144 \) should be added to both sides to complete the square for \( x \).
- The number \( 100 \) should be added to both sides to complete the square for \( y \).
Thus, the final answer is:
- The number \( 100 \) should be added to both sides of the equation to make the left side the sum of a perfect square trinomial in \( y \).
Quick Answer
The number \( 100 \) should be added to both sides of the equation to make the left side the sum of a perfect square trinomial in \( y \).
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