Simplification Ques 39
Question-
$[(5 \sqrt{7}+\sqrt{7}) \times(4 \sqrt{7}+8 \sqrt{7})]-$ $(19)^{2}=$ ?
(1) 143
(2) $72 \sqrt{7}$
(3) 134
(4) $70 \sqrt{7}$
(5) None of these
Show Answer
Correct Answer: (1)
Solution: (1)
$?=6 \sqrt{7} \times 12 \sqrt{7}-(19)^{2}$
$=504-361=143$
BETA
