Question

If z = 15, what would the expression z2 − 2z + 15 be equal to?

Answer 1

Expressions

Substitute 15 for z.

z² - 2z + 15

15² - 2 * 15 + 15

225 - 30 + 15

225 - 15

210

The expression is equal to 210.

Answer 2

`\huge\boxed{\sf 210}`

Explanation:

Given expression:

= z² - 2z + 15

Put z = 15

= (15)² - 2(15) + 15

= 225 - 30 + 15

= 195 + 15

= 210

So, substituting z = 15 makes the expression equal 210.

`\rule[225]{225}{2}`