How do you solve this mathematical question 2×=-20 ?

If a > 0, then a ˣ > 0 for all real number

Therefore 2ˣ = -20 has not solution (x ∈ ∅).

If in the question is positive 20, then:

Used:

in mathematics, a function is a relationship between two variables such that the value of one of the variables, called the dependent variable, is determined by the value of the other variable, called the independent variable. there is a specific term we use to describe the set of independent variables of a function.