Question

1. simplify $3xy(5x + 3 - 7y)$.○ $15xy + 3xy - 21xy^2$○ $15x^2y + 9xy - 21xy^2$○ $15x^2y + 3 - 7y$○ $8x^2y + 6xy - 4xy^2$

Explanation:

Step1: Distribute $3xy$ to $5x$

$3xy \times 5x = 15x^2y$

Step2: Distribute $3xy$ to $3$

$3xy \times 3 = 9xy$

Step3: Distribute $3xy$ to $-7y$

$3xy \times (-7y) = -21xy^2$

Step4: Combine all terms

$15x^2y + 9xy - 21xy^2$

Answer:

15x²y + 9xy - 21xy² (the second option)