An injective function is not a function that is surjective. This means that you want a function that has a unique output for each input, that doesn't cover the natural numbers.
In formal terms a function [Math Processing Error] is injective if [Math Processing Error] implies [Math Processing Error].
We also know that it's not surjective because no value maps to [Math Processing Error] (or any odd number) since if [Math Processing Error], then [Math Processing Error]. However, since [Math Processing Error], the function isn't surjective.
Answer is B.
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Hi there!
Combining th' like terms of the expressions.
(7y² - 3y) + (8y² - 8y)
7y² - 3y + 8y² - 8y
(7y² + 8y²) + (-3y - 8y)
15y² - 11y
Hence,
Option [ 1. ] - 15y² - 11y is Correct
~ Hope it helps!