Question

can anyone tell me about tenses full details please​

Answer 1

Explanation:

Sometimes the quadratic factors do not factor into linear factors of the reals, but if you extend the numbers to the complexes, then they do. In other words, non-real roots imply that your polynomial cannot be factored into linear factors over the reals...you will inevitably have quadratic factors.

Answer 2

Answer:

tense (noun): a verb-based method used to indicate the time, and sometimes the continuation or completeness, of an action or state in relation to the time of speaking. ORIGIN Latin tempus "time"

The concept of tense in English is a method that we use to refer to time - past, present and future. Many languages use tense to talk about time. Other languages have no concept of tense at all, but of course they can still talk about time, using different methods.

So, we talk about time in English with tense. But, and this is a very big but:

we can also talk about time without using tense (for example, going to is a special construction to talk about the future, it is not a tense)

one tense does not always talk about one time (for example, we can use the present tense, or even the past tense, to talk about the future - see tense and time for more about this)

Note that many grammarians take the view that there are only two tenses in English: present tense and past tense. That is because we make those two tenses with the verb alone - he walks, he walked. They do not consider that he will walk, he is walking or he has walked (for example) are tenses because they are not formed solely from the verb "walk". For English learners, most EFL teachers and books treat all these constructions as tenses. On these pages we do the same.