Question

If f(x)= 4x+3 and g(x)= 3x evalute f(x). g(x) for x=-1 over 2

Answer 1

$\bf \begin{cases} f(x)=4x+3\\ g(x)=3x\\ ------------\\ f(x)\cdot g(x)=(4x+3)(3x)\\ \qquad \qquad \qquad 12x^2+9x \end{cases} \\\\\\ \boxed{x=-\cfrac{1}{2}}\qquad \qquad 12\left( -\frac{1}{2} \right)^2+9\left( -\frac{1}{2} \right)\implies 12\left( -\frac{1}{2} \right)\left( -\frac{1}{2} \right)+9\left( -\frac{1}{2} \right) \\\\\\ 12\left( \cfrac{1}{4} \right)-\cfrac{9}{2}\implies 3-\cfrac{9}{2}\implies \cfrac{6-9}{2}\implies \cfrac{-3}{2}\implies -1\frac{1}{2}$