Find the standard form of the quadratic equation: f(x)=(2x-1)(x+4)

Answer:
[tex] f(x) = 2x ^{2} + 7x - 4[/tex]
Step-by-step explanation:
[tex] \because \: f(x) = (2x - 1)(x + 4) \\ \therefore \:f(x) = 2x(x + 4) - 1(x + 4) \\ \therefore \:f(x) = 2x ^{2} + 8x - x - 4 \\ \therefore \:f(x) = 2x ^{2} + 7x - 4 \\ [/tex]