Question

multiply. 7i·8i 7i·8i=□ (simplify your answer. type your answer in the form a + bi.)

Explanation:

Step1: Multiply the coefficients

$7\times8 = 56$

Step2: Multiply the imaginary units

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

Step3: Combine the results

$56\times i^{2}=56\times(-1)=-56+0i$

Answer:

$-56 + 0i$