Stephen K. answered 08/26/14
Tutor
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Physics PhD experienced in teaching undergraduates
Tifa,
I take you wish to simplify the expression: -4·a5(6·a5)
Try writing the terms like this since everything is being multiplied: (-4)(6)(a5)(a5)
Then -24·(a5)(a5) = -24·a5+5 = -24·a10