Question

(x+6)²-(x-5)•(x+5)=79

Answer 1

Ответ:

(x+6)²-(x-5)•(x+5)=79

x²+12x+36-(x²-25)=79

x²+12x+36-x²+25=79

12x+61=79

12x=79-61

12x=18

x=1,5