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pevin120
30.07.2019 •
Mathematics
Amir evaluated 5x - (x + 3)2 for x = 2, as shown. describe amir's mistake and find the correct answer. 5(2) - (2 + 3)2 = 10 + (-5)2 = 10 + 25 = 35
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Ответ:
Answer with Step-by-step explanation:
We are given a expression:
and we have to evaluate it at x=2
Putting x=2 in above expression, we get
Amir's Calculation is as follows:
He took the minus sign before the bracket of (2+3)² inside the bracket
i.e. instead of writing -(2+3)²= -5²= -25
he wrote it as -(2+3)²= (-5)²
and the correct answer is:
-15
Ответ: