If the function y = 1 + 2 ^ x + a.4 ^ x is greater than zero on (- infinity, 1), the value range of real number a is obtained

If the function y = 1 + 2 ^ x + a.4 ^ x is greater than zero on (- infinity, 1), the value range of real number a is obtained

Y = 1 + m + A * m ^ 2 m = 2 ^ x x = (- infinite 1] m = (0,2]
a> When y = 0, y is always greater than 0
When A0 solves a > - 3 / 4
So a > - 3 / 4