Substitute 15 for z.
z² - 2z + 15
15² - 2 * 15 + 15
225 - 30 + 15
225 - 15
210
The expression is equal to 210.
Answer:
Explanation:
= z² - 2z + 15
Put z = 15
= (15)² - 2(15) + 15
= 225 - 30 + 15
= 195 + 15
So, substituting z = 15 makes the expression equal 210.
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