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27 September, 09:03

Evaluate the expression 7a² - 3b³ when a) a = 4, b = - 2 b) a = - 8, b=5

You will end up with 2 answers here, substitute and solve.

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  1. 27 September, 11:57
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    Step-by-step explanation:

    7a²-3b²

    Replace a=4, b=2

    7*4²-3*2²

    = 112-12

    = 100 first answer

    7a²-3b²

    Replace a=8, b=5

    7*8²-3*5²

    448-75

    = 373 second answer
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