4 years ago

Simplify: (3x2 − 5xy + 2y2) − (7x2 − 3xy − 3y2)

Mathematics

2 answers:

svlad2 [7]4 years ago

4 0

Answer:

-4x² - 2xy + 5y²

Step-by-step explanation:

Step 1: Write expression

(3x² - 5xy + 2y²) - (7x² - 3xy - 3y²)

Step 2: Distribute negative

3x² - 5xy + 2y² - 7x² + 3xy + 3y²

Step 3: Combine like terms

-4x² - 2xy + 5y²

sergejj [24]4 years ago

4 0

Answer:

− 4 x^ 2 + 5 y^ 2 − 2 x y

Step-by-step explanation:

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3 years ago

Read 2 more answers

7x - 2 = 2y

ser-zykov [4K]

$\left\{\begin{array}{ccc}7x-2=2y\\3x=2y-1\end{array}\right\\\\substitution:\\\\3x=7x-2-1\\3x-7x=-3\\-4x=-3\ \ \ /:(-4)\\x=\frac{3}{4}\\\\2y=7\cdot\frac{3}{4}-2=\frac{21}{4}-2=\frac{21}{4}-\frac{8}{4}=\frac{13}{4}\\2y=\frac{13}{4}\ \ \ \ /:2\\y=\frac{13}{8}\\\\Answer:x=\frac{3}{4};\ y=\frac{13}{8}.$