Question

2. x^4+4 is equal to
(a) (x^2+2)(x^2-2) (b) (x^2+2x)(x-2)
(c) (x^2+2x+2)(x^2-2x+2) (d) none of these
2. x^4+4 is equal to
(a) (x^2+2)(x^2-2) (b) (x^2+2x)(x-2)
(c) (x^2+2x+2)(x^2-2x+2) (d) none of these
@Mathematics

Answer 1

(d)

Answer 2

sorry, (C)

Answer 3

Can you explain how?

Answer 4

I think it can be rewritten as (x^2)^2+2^2

Answer 5

yeah, add 4x^2 and again minus 4x^2
u will get the expression :)

Answer 6

Did not understand.

Answer 7

x^4+4=x^4+4x^2+4-4x^2=(x^2+2)^2-(2x)^2=(x^2+2x+2)(x^2-2x+2)

Answer 8

How (x^2+2)^2-(2x)^2=(x^2+2x+2)(x^2-2x+2) ?

Answer 9

because, x^2-y^2=(x+y)(x-y)

Answer 10

Thanks Arnab

Answer 11

np :)

Answer 12

What does np mean?

Answer 13

no problem :)