দুটি সংখ্যার গুনফল x2-
10x+21,একটি সংখ্যা (x-3) হলে,
অপর সংখ্যাটি কত?
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Answer:
x2+(7+3)x+21
=x2+7x+3x+21
=x(x+7) +3(x+7)
=(x+7)(x+3)
one number is (x+3) and another number is (x+7)
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