Question

simpilyfy (5+root7) (5-root7)​

Answer 1

Answer:

18

Step-by-step explanation:

5(5-√7)+√7(5-√7)

25-5√7+5√7-7 ( 5√7 will cancel)

25-7

18

hope it help ☺☺

Answer 2

$(5 + \sqrt{7} )(5 - \sqrt{7} ) \\ by \: the \: identity \:o f \: (x + y)(x - y) = {x}^{2} - {y}^{2} \\ 25 - { \sqrt{7} }^{2} \\ 25 - 7 \\ 18$