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7 May, 16:07

What is the sign of - 4 a b - 4ab when a > 0 a>0 and b < 0 b<0?

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  1. 7 May, 19:38
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    The sign is positive.

    Step-by-step explanation:

    a > 0 and b < 0

    So, a·b < 0

    ⇒ - 4·a·b > 0

    ⇒ - 4·a·b - 4·a·b > 0

    Hence, the sign will be positive
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