Question

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

Answer 1

Answer:

$f(x) = 2x ^{2} + 7x - 4$

Step-by-step explanation:

$\because \: f(x) = (2x - 1)(x + 4) \\ \therefore \:f(x) = 2x(x + 4) - 1(x + 4) \\ \therefore \:f(x) = 2x ^{2} + 8x - x - 4 \\ \therefore \:f(x) = 2x ^{2} + 7x - 4$