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5x2 + 15 is the same as 10x+15 factor out a 5 since both the 10 and 15 are divisible by 5 now you have... 5(2x+3) and that's your answer
5(5x2=10; 5x3=15; 5x9=45)
5x2=10...take 5 two times..5+5=10
5x2 = 3 then x2 = 3/5 so that x = sqrt(3/5) = ± 0.7746
5x2 + 20 = 5*(x2 + 4) which cannot be factorised further.