4x^2-8=-21

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Solution for 4x^2-8=-21 equation: 



4x^2-8=-21

We move all terms to the left:

4x^2-8-(-21)=0

We add all the numbers together, and all the variables

4x^2+13=0

a = 4; b = 0; c = +13;
Δ = b2-4ac
Δ = 02-4·4·13
Δ = -208
Delta is less than zero, so there is no solution for the equation

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