Ответ:

Объяснение:

1) 9x² - 24x+16+ 4x² - 16 + 65x = 13x²+41x = x(13x+41) = -3(-39+41) = -6

2) x² - y² = 64

   x-y = 2

(x-y)(x+y) = 64

y = x-2

2(x+x-2) = 64

2x-2 = 32

x-1 = 16

x = 17

y = 15

3) x²-y² = 25

    x+y = 25

(x+y)(x-y)=25

y = 25-x

25(2x-25) = 25

2x = 26

x = 13

y = 12