1.

Factorise:(viii) -18+11x-x^2

Answer»

=  -18+11x-x^2

=  -{x^2-11x+18}

=  -{x^2-9x-2x+18}

=  -{x(x-9)-2(x-9)}

=  -(x-9)(x-2)

therefore, value of x is equal to 2 or 9.



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