Question

Prove that the value of the expersion y^2-10y+30 can only be a positive number

Answer 1

Answer:

• See below

Step-by-step explanation:

• y² - 10y + 30 =
• y² - 10y + 25 + 5 =
• (y - 5)² + 5

Since (y - 5)² ≥ 0, the expression above is positve:

• (y - 5)² + 5 ≥ 5

Answer 2

Your answer is attached with explanation.

Thankyou!