Need help with algebra 1b polynomails.?

Question

Directions: Write the factored form of each expression.

1. -xy + 21 + 7x -15

2. -3(x)squared - (y)squared z + (x)squared z + 3(y)squared


yeahh I suck at math haha but please help.

thank you

Answer 1

1. I suppose there is an error in your text

2.
- 3x ²- y²z + x²z + 3y²
= - 3x² - 3(-y²) + x²z - y²z
= - 3(x² - y²) + z(x² - y²)
= (-3 + z) (x² - y²)
= (z - 3)(x - y)(x + y)