If your question was 2X + 5 =10. X equals what? Then X=2.5
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2x+5=-91-10x 12x+5=-91 12x=-96 x=-8
10x + 5 which is also equal to 5(2x + 1)
If the line y = 2x+1.25 is a tangent to the curve y^2 = 10x then it works out that when x = 5/8 then y = 5/2
4x2 + 12x + 5 = 4x2 + 2x + 10x + 5 = 2x(2x+1) + 5(2x+1) = (2x+1)(2x+5)
12x + 5 - 2x =(12x - 2x) + 5 =10x + 5 =5 (2x + 1)