In mathematics of grade one of senior high school, the root of equation and the zero point of function Using the image of the function, the approximate interval of the zeros of the following functions is pointed out (1) F (x) = the third power of negative x + 3x + 5; (2) F (x) = the (R-1) power of E + 4x-4; Please help me. I can't type some symbols. Thank you~ Just talk about how to do it. Thank you

In mathematics of grade one of senior high school, the root of equation and the zero point of function Using the image of the function, the approximate interval of the zeros of the following functions is pointed out (1) F (x) = the third power of negative x + 3x + 5; (2) F (x) = the (R-1) power of E + 4x-4; Please help me. I can't type some symbols. Thank you~ Just talk about how to do it. Thank you

f(x)=3^x-x^2
f(-1)=1/3-1=-2/30
Because the function values are different at both ends, there must be real roots at [- 1,0]