Answer: 48
Concept:
Here, we need to understand the idea of evaluation.
When encountering questions that gave you an expression with variables, then stated: "If x = a, y = b, z = c" (a, b, c are all constants), this means you should substitute the value given for each variable back to the expression.
Solve:
Given information
a = 2
b = -5
Given expression
2a (a - 2b)
Substitute values into the expression
=2 (2) ((2) - 2 (-5))
Simplify by multiplication
=4 (2 - (-10))
=4 (2 + 10)
Simplify by addition
=4 (12)
Simplify by multiplication
=
Hope this helps!! :)
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