Question

(-7+4root7-3root7)is
A) positive rational no. B) equals to zero c) an irrational no. D) negative rational no.

Answer 1

$\tt \green{Question}$

$- 7 + 4 \sqrt{7} - 3 \sqrt{7}$

$= - 10\sqrt{7}$

$= 26.45751311$

$\tt \: is \: \: an \: irrational \: number \:$

(it can not can expressed in p/q form where q not equal to 0.)