factorise x4+5x2+9 by identity a2-b2=(a+b)(a-b).

here 4,2 are the powers of this expression.

Asked by shubham0kumar24 | 30th May, 2019, 11:01: AM

Expert Answer:

x to the power of 4 plus 5 x squared plus 9
equals x to the power of 4 plus 6 x squared plus 9 minus x squared
equals open parentheses x squared plus 3 close parentheses squared minus x squared
equals open parentheses x squared plus 3 plus x close parentheses open parentheses x squared plus 3 minus x close parentheses

Answered by Renu Varma | 30th May, 2019, 11:15: AM