Answer:
Tyrese did not follow the order of operations (PEMDAS) and carry out the exponent first.
Step-by-step explanation:
Tyrese's workings:
2 × 3² - 3 × 3
= 6² - 9
= 36 - 9
= 27
The mistake Tyrese made was that he didn't follow the order of operations (PEMDAS) and carry out the exponent first.
Correct workings:
Substitute n = 3 into the given expression:
= 2 × 3² - 3 × 3
Carry out the exponent first:
= 2 × 9 - 3 × 3
Now carry out the multiplications:
= 18 - 9
Finally, subtract:
= 9
