Question

tolong ya kak atau bang..... thx​

Answer 1

(x + 3y)² - (x - 3y)²

= (x² + 3²y²) - (x² - 3²y²)

= (x² + 9y²) - (x² - 9y²)

= y²

(x + 3) x (x + 2) + (x - 5)²

= (x + 6) - (x² -5²)

= (x + 6) - x² - 25)

= (x² + (6 - 25)

= x² + (-19)