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What is the value of \(\left(4+\sqrt{7}\right)\left(4-\sqrt{7}\right)\)?
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Answer and explanation
Correct answer: (9)
Step 1: This is of the form \((a+b)(a-b)=a^2-b^2\). Step 2: \(4^2-(\sqrt{7})^2=16-7=9\). Step 3: In conjugate multiplication, directly use the difference of squares.
Frequently asked questions
What is the correct answer to this question?
(9)
Why is this the correct answer?
Step 1: This is of the form \((a+b)(a-b)=a^2-b^2\). Step 2: \(4^2-(\sqrt{7})^2=16-7=9\). Step 3: In conjugate multiplication, directly use the difference of squares.
Which subject and chapter does this question cover?
This is a Class 10 Mathematics question. Chapter: Real Numbers. Topic: Irrational numbers.
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