2x(7-5x)=21

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Solution for 2x(7-5x)=21 equation: 



2x(7-5x)=21

We move all terms to the left:

2x(7-5x)-(21)=0

We add all the numbers together, and all the variables

2x(-5x+7)-21=0

We multiply parentheses

-10x^2+14x-21=0

a = -10; b = 14; c = -21;
Δ = b2-4ac
Δ = 142-4·(-10)·(-21)
Δ = -644
Delta is less than zero, so there is no solution for the equation

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