一元二次方程x2+4x﹣3=0的两根为x1、x2,则x1•x2的值是( )
A:4
B:-4
C:3
D:-3
填一填
—Will the football match be covered_______ ?
—Yes, but if you are not a sports fan, you might find it a bit___________.
已知指数函数y=g(x)满足:g(2)=4,定义域为R的函数f(x)=-gx+n2gx+m是奇函数.
(1)确定y=g(x)的解析式;
(2)求m,n的值;
(3)若对任意的t∈R,不等式f(t2﹣2t)+f(2t2﹣k)<0恒成立,求实数k的取值范围.