20=15+2x(-3x+4)

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Solution for 20=15+2x(-3x+4) equation: 



20=15+2x(-3x+4)

We move all terms to the left:

20-(15+2x(-3x+4))=0



We calculate terms in parentheses: -(15+2x(-3x+4)), so:

15+2x(-3x+4)

determiningTheFunctionDomain
2x(-3x+4)+15

We multiply parentheses

-6x^2+8x+15

Back to the equation:

-(-6x^2+8x+15)



We get rid of parentheses

6x^2-8x-15+20=0

We add all the numbers together, and all the variables

6x^2-8x+5=0

a = 6; b = -8; c = +5;
Δ = b2-4ac
Δ = -82-4·6·5
Δ = -56
Delta is less than zero, so there is no solution for the equation

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