4. \( 5 x y-8 x y \) 5. \( \frac{1}{2} x^{2}-\frac{5}{4} x^{2} \) 6. \( x y^{2}+\frac{3}{8} x y^{2} \)
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You can simplify \( 5 x y - 8 x y \) by combining like terms, so you would get \( -3 x y \)! It’s like having five cookies and then losing eight; you end up with three fewer cookies than before. For \( \frac{1}{2} x^{2} - \frac{5}{4} x^{2} \), first find a common denominator, which is 4. It turns into \( \frac{2}{4} x^{2} - \frac{5}{4} x^{2} = -\frac{3}{4} x^{2} \). Think of it as collecting a half pizza and then someone taking away five-fourths—sorry, but it looks like you're in the negative pizza territory!
