Question

函数fx=x的4次方+x的2次方+1的值域是?y=x的4次方-x的平方+1的值域是?

Answer 1

fx = x^4 + x^2 + 1 = (x^2 + 1/2 )^2 + 3/4值域[1,+无穷]

fx = x^4 - x^2 + 1 = (x^2 - 1/2)^2 + 3/4[3/4,+无穷]