Answer:
x≈12.6
Explanation:
We have the equation:
19(1.12^x) = 8(1.18^x)
Divide both sides by 8:
19/8 (1.12^x) = (1.18^x)
Take the natural logarithm of both sides:
ln[19/8 (1.12^x)] = ln[1.18^x]
Using the properties of logarithms, we can simplify the left side:
ln(19/8) + ln(1.12^x) = x ln(1.18)
Substituting y = 1.12^x, we get:
ln(19/8) + ln(y) = ln(1.18) y
Now we can solve for y:
ln(y) = ln(1.18) y - ln(19/8)
Using a numerical method or a graphing calculator, we can find that y ≈ 10.584.
Substituting back to solve for x:
1.12^x ≈ 10.584
Taking the logarithm base 1.12 of both sides:
x ≈ ln(10.584)/ln(1.12)
x ≈ 12.6
Therefore, the solution to the equation is x ≈ 12.6.