Answer: 51
Explanation:
We will use the Order of Operations, sometimes known as PEMDAS.
Given:
5x² - x + 9
Plug in the value of 3:
5(3)² - (3) + 9
To the power of 2:
5(9) - 3 + 9
Multiply:
45 - 3 + 9
Subtract:
42 + 9
Add:
51
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