Answer:
The solution of the equation is
⇒ 3rd answer
Step-by-step explanation:
* Lets explain how to solve this problem
- The function f(x) = e^x is called the (natural) exponential function
- The natural logarithm (㏑), or logarithm to base e, is the inverse
function to the natural exponential function
∵
is an exponential function
∴ We can solve it by using the inverse of e (㏑)
- Remember:
# 
# 
- Insert ln in both sides
∴ 
∵ 
∴ 2x + 5 = ㏑(4)
- Subtract 5 from both sides
∴ 2x = ㏑(4) - 5
- Divide both sides by 2 to find x
∴ 
* The solution of the equation is 
Answer:
(x-1)(x+1)(x+5)
Step-by-step explanation:
x^3+5x^2 - x-5=
x^3-x+5x^2-5=
x(x^2-1) +5(x^2 - 1)=
(x^2- 1)(x+5)=(*)
(x-1)(x+1)(x+5)
(*) A^2 - B^2 =(A-B)(A +B)
-5.6(repeating 6), -√(21), 3&9/10, 5.2