Question

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Answer 1

Respuesta:

y=4

Explicación paso a paso:

Formula:

(a-b)^2=a^2-2ab+b^2

Solucion:

y^2-2*7*y+(-7)^2-[1^2-2*1*y+(-y)^2]=6y-8

y^2-14y+49-[1-2y+y^2]=6y-8

y^2-14y+49-1+2y-y^2=6y-8

14y+49-1+2y=6y-8

16y+48=6y-8

10y=40

y=4