Question

ayudaaaaaaa ya porfa

Answer 1

a) $-5\sqrt{700}-7\sqrt{63}=5*10\sqrt{7}-7*3\sqrt{7}=\sqrt{7}(5*10-7*3)=\sqrt{7}(50-21)=29\sqrt{7}$

b)8√720-3√180-√245=8*12√5-3*6√5-7√5=√5(8*12-3*6-7)=√5(96-18-7)=72√5