Question

Is this number (8-√7) (8+√7). rational or irrational? justify your answer​

Answer 1

Answer:

yes it is rational because

(8-√7) (8+√7)

64-7

57

so it is rational no.

Answer 2

Answer:

$\sf\colorbox{pink}{⇨ AnsweR ⇦}$

$(8 - \sqrt{7} )(8 + \sqrt{7} ) \\ \\ = {(8)}^{2} - ( { \sqrt{7} )}^{2} \\ \\ = 64 - 7 \\ \\ = 57$

⇛ So it is a rational number .

⇢ hope this much helps ⇠