Question

X2-x-42=(x+k)(x+6) then k=?

Answer 1

Answer:

k=-7

Step-by-step explanation:

factorise

x²-x-42

find out 2 such numbers which have sum as -1

and product as 42

these are 6,-7

so:x²+6x-7x-42

x(x+6)-7(x+6)

factors:(x+6) &(x-7)

hence k=-7