Question

If f(x) = x3 – 2x2, which expression is equivalent to f(i)?

Answer 1

Answer:

$2 - i$

Step-by-step explanation:

Substitute i for x. Remeber i means imaginart number.

${i}^{3} - 2 {i}^{2}$

Use the Imaginary number exponents rules

${i}^{2} = - 1$

${i}^{3} = - i$

$i {}^{4} = 1$

Simplify the equation.

$- i - ( - 2)$

$- i + 2$

Write as a complex number in form a+bi

$2 - i$