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It is 4x^2 + 10x - 1
5(x + 4)(x - 2)
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
5x2 + 20 = 5*(x2 + 4) which cannot be factorised further.
By splitting the Middle Term, 5X2 + 25X + 4X +20 5X(X+5) + 4(X+5) (5X+4)(X+5)