Okay So, Start With Factoring, 10 x 250 = 2500
What times to 2500 and adds to 100, 50x50=2500, 50+50=100
So plug in the 50 and 50, and group the first two and second two, like so
(10x^2+50x)(50x+250) Now Factor Some more
Take out an 10x in first one, so, 10x(x+5)
And a 50 in the second one, so, 50(x+5) Put them together
10x(x+5)50(x+5), You have two (x+5), so move it to frount and combine your outsides.
(x+5)(10x+50)