Let’s solve each expression one by one and match it with the correct result.
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1. 3xy × 4xy
Multiply coefficients: 3 × 4 = 12
Multiply variables: x × x = x², y × y = y² → so x²y²
→
12x²y²
Match:
12x²y²
---
2. -3x²y × 4x
Coefficients: -3 × 4 = -12
Variables: x² × x = x³, y stays → x³y
→
-12x³y
Match:
-12x³y
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3. 3x × (2 - 4y)
Distribute 3x to both terms inside parentheses:
3x × 2 = 6x
3x × (-4y) = -12xy
→
6x - 12xy
Match:
6x - 12xy
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4. 4xy² × (-3y)
Coefficients: 4 × (-3) = -12
Variables: x stays, y² × y = y³ → xy³
→
-12xy³
Match:
-12xy³
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5. 4y × (2x + 3)
Distribute 4y:
4y × 2x = 8xy
4y × 3 = 12y
→
8xy + 12y
Match:
8xy + 12y
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6. 2x × 4y²
Coefficients: 2 × 4 = 8
Variables: x × y² = xy²
→
8xy²
Match:
8xy²
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7. 5xy² + 2xy²
Like terms — same variable part: xy²
Add coefficients: 5 + 2 = 7
→
7xy²
Match:
7xy²
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8. 8x²y - 5x²y
Like terms — same variable part: x²y
Subtract coefficients: 8 - 5 = 3
→
3x²y
Match:
3x²y
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9. -5 × 2y
Multiply: -5 × 2 = -10, times y →
-10y
Match:
-10y
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10. 2 + 4y + 5 - y
Combine like terms:
Constants: 2 + 5 = 7
y terms: 4y - y = 3y
→
3y + 7
Match:
3y + 7
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Now let’s list all matches clearly:
Left Side → Right Side
- 3xy × 4xy →
12x²y²
- -3x²y × 4x →
-12x³y
- 3x × (2 - 4y) →
6x - 12xy
- 4xy² × -3y →
-12xy³
- 4y × (2x + 3) →
8xy + 12y
- 2x × 4y² →
8xy²
- 5xy² + 2xy² →
7xy²
- 8x²y - 5x²y →
3x²y
- -5 × 2y →
-10y
- 2 + 4y + 5 - y →
3y + 7
All matched correctly!
Final Answer:
3xy × 4xy → 12x²y²
-3x²y × 4x → -12x³y
3x × (2 - 4y) → 6x - 12xy
4xy² × -3y → -12xy³
4y × (2x + 3) → 8xy + 12y
2x × 4y² → 8xy²
5xy² + 2xy² → 7xy²
8x²y - 5x²y → 3x²y
-5 × 2y → -10y
2 + 4y + 5 - y → 3y + 7
Parent Tip: Review the logic above to help your child master the concept of algebra for eighth grade worksheet.