10 points! + Evaluate 3n² + 4n -n if n = 7

Please show me how you got that answer.

Use PEMDAS OR BEDMAS..whichever one you choose.

3n² + 4n - n

3 x 7² + 4 x 7 - 7

first do the exponent because there is no parentheses

3 x 49 + 4 x 7 - 7

second do either multiplication or division with ever is closes to the left

147 + 4 x 7 - 7

147 + 28 - 7

third do either addition or subtraction which ever is closes to the left

175 -7

168

finally the answer is 168