Change all the signs.
Suppose you have the quadratic equation: y = ax2 + bx + c
Its additive inverse is -ax2 - bx - c.
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It is a.
-1.4 Additive inverse is a fancy way of saying the opposite.
To find the additive inverse of ANY number, add a minus sign. (If the number already has a minus sign, take the minus sign away to get the additive inverse.)
Additive inverse: change all signs. Multiplicative inverse: flip it over.
The answer depends on what you mean by "opposite": whether it is the additive inverse or the multiplicative inverse.