I'm trying to isolate x to find range, but unsure how to manipulate equation.

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SUMMARY

The discussion centers on isolating the variable x in the quadratic equation y = 8x² + 8x + 5 to find its range. The user attempts to manipulate the equation by subtracting 5 from both sides and dividing by 8, but encounters difficulty with the x² + x component. A suggestion is made to solve the equation 8x² + 8x + 5 - y = 0 to facilitate finding the range.

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Homework Statement


Find Range

Homework Equations


y=8x^2+8x+5

The Attempt at a Solution



y-5=8x^2+8x Subtracted five both sides

(y-1)/8=(x+1)x divided 8 to both sides, and factored x out.

The x^2+x part has me stumped.
 
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Hi My8th! Welcome to PF! :smile:

(try using the X2 button just above the Reply box :wink:)

solve 8x2 + 8x + 5 - y = 0 :wink:
 

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