5dx2 50dx 80d
5dx^2 + 50dx + 80d
first take common 5d from all the terms
= 5d( x^2+10x + 16)
Sum should be 10
Product should be 16, the factors should be 8 and 2 .. because on adding 8+2 ...we get sum 10 and on multiplying ....we get 16 ....
= 5d( x^2 + 8x + 2x + 16)
= 5d (x+8)(x+2)
this should be the answer
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