求值域,(1)y=2x平方+4x-7/(x+1)平方+2 (2)y=5x-1/4x+2

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求值域,(1)y=2x平方+4x-7/(x+1)平方+2 (2)y=5x-1/4x+2

求值域,(1)y=2x平方+4x-7/(x+1)平方+2 (2)y=5x-1/4x+2
求值域,(1)y=2x平方+4x-7/(x+1)平方+2 (2)y=5x-1/4x+2

求值域,(1)y=2x平方+4x-7/(x+1)平方+2 (2)y=5x-1/4x+2
y=2x平方+4x-7/(x+1)平方+2
=2(x+1)^2-9/(x+1)平方+2
=2- 13/(x+1)平方+2
>=-5/4
y=5x-1/4x+2
x≠-1/2

(1)大于等于-9
(2)全体实数