यदि (f(x)=x-2-3x) और (g(x)=x-2+3x) हैं तो ((fg)(x)) क्या है?
If (f(x)=x-2-3x) and (g(x)=x-2+3x) then what is ((fg)(x))?
Explanation opens after your attempt
A. \(x^4-9x^2\)
Concept
((fg)(x)=\(x^2-3x\)\(x^2+3x\)=\(x^2\)2-(3x)2=x-4-9x-2). Use the difference of squares formula.
Why this answer is correct
The correct answer is A. \(x^4-9x^2\). ((fg)(x)=\(x^2-3x\)\(x^2+3x\)=\(x^2\)2-(3x)2=x-4-9x-2). Use the difference of squares formula.
Exam Tip
((fg)(x)=\(x^2-3x\)\(x^2+3x\)=\(x^2\)2-(3x)2=x-4-9x-2)। अंतर वर्ग सूत्र का उपयोग करें।
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