Math, asked by somilsingla, 1 year ago

show that(7 + root 7)(7 - root 7) is a rational number

Answers

Answered by karankirat345

10

☺️ mate check the answer

be brainly

karankirat345: (7 + √7)(7-√7) using (a+b)(a+b)=a^2-b^2 (7)^2-(√7)^2=49-7 = 42
hence it is rational

karankirat345: sorry a mistake occurred

ronitmeena000: This answer is correct or not ??

karankirat345: its surely right

karankirat345: plzzz mark as brnlst

Answered by Anonymous

18

Answer:

(7 + root 7)(7 - root 7)

= (7)^2 - (root 7)^2

= 49 - 7

= 42.

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