Question

factorise -2x*x-18x-40​

Answer 1

Answer

x= -4,-5

Step-by-step explanation:

-2x²-18x -40 =0

-2(x²+9x+20)=0

x²+9x+20=0

x²+4x+5x+20=0

x(x+4) +5(x+4)=0

(x+4)(x+5)=0

so

(x+4)=0 , (x+5)=0

x=-4 , x=-5

so the solution set is {-4,-5}