Solve the inequality 4x^2>5x-1

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Solve the inequality 4x^2>5x-1

We first rearrange the inequality to obtain

4x²-5x+1>0

Initially we approach this as if it were 4x²-5x+1=y, looking for y=0

We then look for solutions, the most general way is to use the quadratic formula, but often we can see factors immediately.By use of the quadratic formula, x<(-b+sqrt(b²-4ac))/2a we get 1 and from x=(-b-sqrt(b²-4ac))/2a we obtain 1/4.

solutions to 4x²-5x+1=0 are therefore x=1,1/4

If we plug a value between these into the equation, say x=1/2 we have y=-1/2 and thus the inequality is solved by x<1/4 and x>1

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