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Braydon Lam
Mathematics
4 October, 17:16
Evaluate 4 (a2 + 2b) - 2b when a = 2 and b = - 2.
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Malone
4 October, 17:35
0
4
Step-by-step explanation:
Firstly simplify your brackets ...,
; 4 (a^2 + 2b) = 4a^2 + 8b ... then substitute it onto the bracket
; 4a^2 + 8b - 2b
; 4a^2 + 6b ..., then substitute with the given values of a and b
; 4 (2) ^2) + 6 (-2)
; 16 - 12 = 4
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