Hello!
Answer:

Explanation:
→ We want to calculate the value of:


→ To caculate, we must to find the value of x.
→ To find the value of x, let's solve the equation:

◼ Add 25 to both sides:

◼ Simplify both sides:

→ So, now, we have the value of x.
→ Therefore, we must to calculate the value of our expressions.
→ Let's replace x by - 50:
↳

↳

→ Simplify the expressions:
↳

↳

Conclusion:
So if we suppose that
:
- the value of
is
- the value of
is
