Answer:
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
