Question

Sum of 4√63+5√7-8√28 is :-

Answer 1

Answer:

heya mate ☺

$4 \sqrt{63} + 5 \sqrt{7} - 8 \sqrt{28} \\ = 4 \sqrt{7 \times 9} + 5 \sqrt{7} - 8 \sqrt{7 \times 4} \\ = 4 \times 3 \sqrt{7} + 5 \sqrt{7} - 8 \times 2 \sqrt{7} \\ = 12 \sqrt{7} + 5 \sqrt{7} - 16 \sqrt{7} \\ = 17 \sqrt{7} - 16 \sqrt{7} \\ = \sqrt{7}$

hope it helps u ✌

pLz dO mArK aS bRaiNliEsT _________♡

hAvE a niCe dAy mAtE

Answer 2

Given :

4√63+5√7-8√28

Solution :

$4 \sqrt{63} + 5 \sqrt{7} - 8 \sqrt{28} \\ \\ = 4 \sqrt{9 \times 7} + 5 \sqrt{7} - 8 \sqrt{7 \times 4} \\ \\ = 4 \times 3 \sqrt{7} + 5 \sqrt{7} - 8 \times 2 \sqrt{7} \\ \\ = 12 \sqrt{7} + 5 \sqrt{7} - 16 \sqrt{7} \\ \\ = 17 \sqrt{7} - 16 \sqrt{7} \\ \\ = \sqrt{7}$

Thanks :)