Question

(у+6)2-(у+5)(у-5)=79

Answer 1

(у+6)²-(у+5)(у-5)=79

y²+12y+36-(y²-25) = 79

12y= 79 -36 -25 = 18

y = 18/12 = 3/2 = 1,5

Answer 2

$(y + 6) {}^{2} - (y + 5)(y - 5) = 79 \\ \\ {y}^{2} + 12y + 36 - ( {y}^{2} - 25) = 79 \\ \\ {y}^{2} + 12y + 36 - {y}^{2} + 25 = 79 \\ \\ 12y + 61 = 79 \\ \\ 12y = 79 - 61 \\ \\ 12y = 18 \\ \\ x = \frac{3}{2} = 1 \frac{1}{2}$