I looked it up on google it is 1252
The technique of matrix isolation involves condensing the substance to be studied with a large excess of inert gas (usually argon or nitrogen) at low temperature to form a rigid solid (the matrix). The early development of matrix isolation spectroscopy was directed primarily to the study of unstable molecules and free radicals. The ability to stabilise reactive species by trapping them in a rigid cage, thus inhibiting intermolecular interaction, is an important feature of matrix isolation. The low temperatures (typically 4-20K) also prevent the occurrence of any process with an activation energy of more than a few kJ mol-1. Apart from the stabilisation of reactive species, matrix isolation affords a number of advantages over more conventional spectroscopic techniques. The isolation of monomelic solute molecules in an inert environment reduces intermolecular interactions, resulting in a sharpening of the solute absorption compared with other condensed phases. The effect is, of course, particularly dramatic for substances that engage in hydrogen bonding. Although the technique was developed to inhibit intermolecular interactions, it has also proved of great value in studying these interactions in molecular complexes formed in matrices at higher concentrations than those required for true isolation.
Since the first term is x², you know that each group will begin with x. To find the second part of the groups, you need to find two numbers that add up to 10 and multiply to 25. You can do this by listing all the factors of 25 until you find a set that adds to 10.
25 x 1
5 x 5
-5 x -5
The second terms in your groups will be -5 and -5.
(x - 5) (x - 5) This can be simplified to (x - 5)².
It's 24 since 24×1=24 and 24×5=120.
