It is 4x^2 + 10x - 1
5(x + 4)(x - 2)
If you mean: 5x2 + 10x + 40 Then the only factoring you can do is to divide it by five: 5(x2 + 2x + 8) beyond which it can not be factored. If on the other hand you mean: 5x2 + 10x - 40 Then you can factor it out as follows: 5x2 + 10x - 40 = 5(x2 + 2x - 8) = 5(x2 - 2x + 4x - 8) = 5(x(x - 2) + 4(x - 2)) = 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
-3x + 10x - 5 + 26 = 7x + 21
The GCF of 10x and 45 is 5.
5x2 + 20 = 5*(x2 + 4) which cannot be factorised further.
6x2 + 10x = 2x(3x + 5)
By splitting the Middle Term, 5X2 + 25X + 4X +20 5X(X+5) + 4(X+5) (5X+4)(X+5)
5
5x2 + 25x + 30 This expression describes a parabola, and can be factored out as follows: = 5(x2 + 5x + 6) = 5(x + 2)(x + 3)
If that's 5x2, it factors to (x + 5)(x2 + 1)