7(-x2)-(x-5)=21

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Solution for 7(-x2)-(x-5)=21 equation: 



7(-x2)-(x-5)=21

We move all terms to the left:

7(-x2)-(x-5)-(21)=0

We add all the numbers together, and all the variables

7(-1x^2)-(x-5)-21=0

We multiply parentheses

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

We get rid of parentheses

-7x^2-x+5-21=0

We add all the numbers together, and all the variables

-7x^2-1x-16=0

a = -7; b = -1; c = -16;
Δ = b2-4ac
Δ = -12-4·(-7)·(-16)
Δ = -447
Delta is less than zero, so there is no solution for the equation

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