Question

factorise the following number 1 X square + 11 x minus 26

Answer 1

here given the number is 

x²+11x-26
if given a quadratic polynomial we have to do this by splitting the middle term.
so by splitting the middle term we have

-26 = 13 ×-2
11   =  13 - 2

so the equation becomes

x² + 13x -2x -26

by taking x as common we have

x(x+13)  -2(x+13)

(x-2)(x+13)

hence the equation becomes factorised