PEDMAS

PEDMAS and BEDMAS are acronyms used in mathematics to represent the order of operations, which determines the sequence in which mathematical operations are executed. In mathematics, the order of operations refers to the specific sequence in which mathematical operations are performed. This sequence is determined by a set of rules, which are often represented by acronyms such as PEDMAS and BEDMAS. PEDMAS stands for Parentheses, Exponents, Multiplication, Division, Addition, and Subtraction, while BEDMAS stands for Brackets, Exponents, Division, Multiplication, Addition, and Subtraction. These rules ensure that mathematical expressions are evaluated correctly and consistently, regardless of the complexity of the expression. By following the order of operations, mathematicians can avoid ambiguity and arrive at the correct solution.

As per the PEDMAS rule, the expression 8 + 7 - 9 / 4 should be solved in the following order: first, divide 9 by 4, then subtract the result from 7, and finally add 8 to the result. This gives us a final answer of 12.75, not 1.5