Question

1. Which of the following is the value of (√11 - 7)(√11 +7)
(a) -4
(b) 4
(c) √11
(d) √7
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Answer 1

(a+b)(a-b) = a^2-b^2

11-49 = -38

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Answer 2

Answer:

apply the identity a^2 - b^2

= (√11)^2 - 7^2

= 11-49

11-49= -38

11-49= -38if it is √7 then your answer will be 4, if not then the options are wrong

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