Question

求这两道题的答案和过程谢谢

Answer 1

(6)

y
=x^2+4x+7
=(x+2)^2 +3
x∈(-3,0]
单调
增桐指逗加=[-2,0]
减逗橘小局卖 =(-3, -2]
f(-2) =3
f(0)=7
f(-3) = 4
值域 =[3,7]
(7)
f(x)=(m-1)x^2+(m+2)x +3
偶函数
m+2=0
m=-2
f(x)=(m-1)x^2+(m+2)x +3 =x^2 +3
增值区 =[ 0,+∞)