A coefficient is a numerical or constant quantity placed before and multiplying the variable in an algebraic expression. Eg : In $$ax^2$$, coefficient is $$a$$ Expression : $$(x + 9)(6 - 4x)$$ = $$6x - 4x^2 + 54 - 36x$$ = $$-4x^2 - 30x + 54$$ $$ herefore$$ Coefficient of $$x^2$$ = -4 => Ans - (B)
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