To evaluate the expression A^2 - 2b^2 when a = 5 and b = 3, we substitute the given values into the expression and perform the necessary calculations.
Given:
a = 5
b = 3
Expression:
A^2 - 2b^2
Substituting the values:
(5)^2 - 2(3)^2
Calculating the squares:
25 - 2(9)
Multiplying:
25 - 18
Subtracting:
7
Therefore, when a = 5 and b = 3, the value of A^2 - 2b^2 is 7.