Question

(5x+by)2
(5y+ 1/2)2
(9a+2)(9a-2)

Answer 1

(5x+by)²

(5x + by) • (5x + by)

25x² + 5byx + 5byx + b²y²

25x² + 10byx + b²y²

(5y+ 1/2)²

(5y + 1/2) • (5y + 1/2)

25y² + 5/2y + 5/2y + 1/4

25y² + 10/2y + 1/4

25y² + 5y + 1/4

(9a+2)(9a-2)

81a² - 18a + 18a - 4

81a² - 4