Given the following question:
Using PEMDAS
P - Parentheses
E - Exponent
M - Multiplication
D - Division
A - Addition
S - Subtraction
To solve a equation using PEMDAS you will go up at P, to down with S. You go in a straight line and solve the equation step by step.
6 - 4(8 - 3)^2 + 15
First P
8 - 3 = 5
6 - 4 * 5^2 + 15
E is next
5^2 = 5 * 5 = 25
6 - 4 * 25 + 15
M is next
4 * 25 = 100
6 - 100 + 15
D is next but there is no D
6 - 100 + 15
A is next
100 + 15 = 115
6 - 115
Now we have s
6 - 115 = -79
= -79
Your answer is -79.