If `x^2-7x=-12` , what is the value of `x` ?

If 2x=3+5i, then what is the value of 2x^(3)+2x^(2)-7x+72 ?

IF f(x) = tan x+e^(-2x)-7x^(3) , then what is the value of f'(0)?

If 9:12(2)/(3)=81:(x+2) ,then what is the value of x?

If a, ß are the zeroes of the polynomial f(x) = x^2 - 7x + 12 , then find the value of 1/alpha + 1/beta .

If f(x)=tanx+e^(-2x)-7x^(3) . Then what is the value of f'(0) ?