# Thread: Multiplicative inverse

1. ## Multiplicative inverse

Find the multiplicative inverse of [87] in Z150.

Use this answer to find all x in Z150 so that [87]x = [11].

Thanks guys

2. Originally Posted by suedenation
Find the multiplicative inverse of [87] in Z150.

Use this answer to find all x in Z150 so that [87]x = [11].

Thanks guys
I understand your question as,
Given the ring with unity $\mathbb{Z}_{150}$ find the multiplicative inverse of $87$.
Thus, you need to solve the congruence,
$87x\equiv 1\mod (150)$