The factors of 5 are 1 and 5.
12 = 2 x 5 + 2 x 1, therefore:
4x2 +12x +5 = (2x + 1)(2x + 5)
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It simplifies to: 12x+3y
12x2 + 7x + 1 = 12x2 + 3x + 4x + 1 = 3x*(4x + 1) + 1*(4x + 1) = (4x + 1)*(3x + 1)
(5x 2 - 8x + 1) + (2x 2 - 4x - 11)
Because you are just adding the same variable to itself, the variable does not change. in the same way that 2 + 2 is 4, 2x2 + 2x2 is 4x2.
Solving these simultaneous equations by the elimination method:- x = 1/8 and y = 23/12