Answer:
b
Step-by-step explanation:
Distribute parenthesis and collect like terms, noting that the second parenthesis is distributed by - 1
(4x² - 8xy +2y²) - (9x² - 4xy - 7y²)
= 4x² - 8xy + 2y² - 9x² + 4xy + 7y² ← collect like terms
= (4x² - 9x²) + (- 8xy + 4xy) + (2y² + 7y²)
= - 5x² - 4xy + 9y² → b
Answer:
Choice b is correct answer.
Step-by-step explanation:
Given expression is:
(4x²-8xy+2y²) - ( 9x²-4xy-7y²)
We have to simplify above expression.
Step 1 . Open small brackets and multiply negative sign to the terms of second small bracket.
4x² - 8xy + 2y² - 9x² + 4xy + 7y²
Step 2. Gather like terms
4x²-9x²-8xy+4xy+2y²+7y²
Step 3. Add the coefficients of like terms
(4-9)x²+(-8+4)xy+(2+7)y²
(-5)x²+(-4)xy+(9)y²
-5x²-4xy+9y² which is the final answer.
