а)(2а+3)(2а-3) ,б)(у-5b)(y+5b),в)(0.8x+y)(y-0.8x)

Question

а)(2а+3)(2а-3) ,б)(у-5b)(y+5b),в)(0.8x+y)(y-0.8x)

Answer 1

a) 4a2 - 9

b) y2- 25b2

c)y2 - 0.64x2 

Answer 2

(y - 5b)(y + 5b) = y² - 25b²

(0,8x + y)(y - 0,8x) = y² - 0,64x²

(2a + 3)(2a - 3) = 4a² - 9