12a - 3b2, when a=9, b=4

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Paula Fleck · Answer 1 · 2020-05-21T13:17:22+0000

Explanation:

Write out equation

12a-3b2

Sub in variables and add needed signs

12×9-3×4×2

Solve multiplication

108-24

Finally, subtract

84

12a - 3b2, when a=9, b=4

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