Answer:
The correct answer is 5y-7
Step-by-step explanation:
Given that a quadratic expression is in the form ax²+bx+c where a,b and c are integers, we can factorize as follows
To factorize the expression 5y^2-12y+7, we need to find two numbers that when multiplied we get 5×7, that is ac, and that when added they give us -12 which is b,
these numbers are -7 and -5
therefore, 5y²-5y-7y+7 is our expression
Factorizing we get
5y(y-1)-7(y₋1)
This gives (y-1) (5y-7) as the factorized form of 5y²₋12y+7
Therefore the missing factor is 5y-7
