( (3x+2)(3x+5) ) का प्रसार कौन सा है?
Which is the expansion of ( (3x+2)(3x+5) )?
Explanation opens after your attempt
B. \(9x^2+21x+10\)
Concept
\(3x\cdot5+2\cdot3x=15x+6x=21x\). Exam tip: add both cross terms.
Why this answer is correct
The correct answer is B. \(9x^2+21x+10\). \(3x\cdot5+2\cdot3x=15x+6x=21x\). Exam tip: add both cross terms.
Exam Tip
\(3x\cdot5+2\cdot3x=15x+6x=21x\) है। परीक्षा में दोनों क्रॉस पद जोड़ें।
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