The additive universe of -7
19

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Step-by-step explanation:

Note: The number is not in proper form. Consider the given number is .

If a number is added to another number and we get zero, then the added number is known as additive inverse.

Let a be a number, then

So, -a is the additive inverse of a. It means, additive inverse is the same number with opposite sign.

Consider the given number is .

Therefore, the additive inverse of is .

225x²+4=0

225x²=0-4

225x²=-4

x²=-4/225

x=±√-4/225