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7.8+2(0.75x^2+0.4)=-6.4x^2+4(0.5x^2-0.8)
We move all terms to the left:
7.8+2(0.75x^2+0.4)-(-6.4x^2+4(0.5x^2-0.8))=0
We multiply parentheses
-(-6.4x^2+4(0.5x^2-0.8))+0x+0.8+7.8=0
We calculate terms in parentheses: -(-6.4x^2+4(0.5x^2-0.8)), so:We add all the numbers together, and all the variables
-6.4x^2+4(0.5x^2-0.8)
We multiply parentheses
-6.4x^2+0x-3.2
We add all the numbers together, and all the variables
-6.4x^2+x-3.2
Back to the equation:
-(-6.4x^2+x-3.2)
-(-6.4x^2+x-3.2)+x+8.6=0
We get rid of parentheses
6.4x^2-x+x+3.2+8.6=0
We add all the numbers together, and all the variables
6.4x^2+11.8=0
a = 6.4; b = 0; c = +11.8;
Δ = b2-4ac
Δ = 02-4·6.4·11.8
Δ = -302.08
Delta is less than zero, so there is no solution for the equation
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