91=(2x-3)(2x+3)

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Solution for 91=(2x-3)(2x+3) equation: 



91=(2x-3)(2x+3)

We move all terms to the left:

91-((2x-3)(2x+3))=0

We use the square of the difference formula

4x^2+9+91=0

We add all the numbers together, and all the variables

4x^2+100=0

a = 4; b = 0; c = +100;
Δ = b2-4ac
Δ = 02-4·4·100
Δ = -1600
Delta is less than zero, so there is no solution for the equation

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