Answer: Option (C)
Step-by-step explanation:
Look for a pair of numbers whose PRODUCT is the product of the first and last numbers ( −10 ) and sum is the middle number ( −3 ) .
The two numbers that meet these criteria are −5 and 2 .
Rewrite the −3x term in the expression as −5x + 2x .
10 x 2 − 5x + 2x − 1
Factor by grouping.
(10 x 2 − 5x) + (2x − 1)
5x(2x − 1) + 1 (2x − 1)
(5x + 1) (2x − 1)