Solve the equation x=a f(b) - b f(a) / f(b) - f(a)
a=3
b=4
f(a)= -3.4
f(b)=3.39
You asked:
Solve the system of equations:\[\begin{aligned}x &= a \cdot f\left( b \right) - \frac{b \cdot f\left( a \right)}{f\left( b \right)} - f\left( a \right)\\a &= 3\\b &= 4\\f\left( b \right) &= 3.39\\f\left( a \right) &= -3.4\end{aligned}\]