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(2-x)(5x+1)-(3+x)(x-1)+8x*x-15x+3=0
We add all the numbers together, and all the variables
(-1x+2)(5x+1)-(x+3)(x-1)+8x*x-15x+3=0
We add all the numbers together, and all the variables
-15x+(-1x+2)(5x+1)-(x+3)(x-1)+8x*x+3=0
Wy multiply elements
8x^2-15x+(-1x+2)(5x+1)-(x+3)(x-1)+3=0
We multiply parentheses ..
8x^2+(-5x^2-1x+10x+2)-15x-(x+3)(x-1)+3=0
We get rid of parentheses
8x^2-5x^2-1x+10x-15x-(x+3)(x-1)+2+3=0
We multiply parentheses ..
8x^2-5x^2-(+x^2-1x+3x-3)-1x+10x-15x+2+3=0
We add all the numbers together, and all the variables
3x^2-(+x^2-1x+3x-3)-6x+5=0
We get rid of parentheses
3x^2-x^2+1x-3x-6x+3+5=0
We add all the numbers together, and all the variables
2x^2-8x+8=0
a = 2; b = -8; c = +8;
Δ = b2-4ac
Δ = -82-4·2·8
Δ = 0
Delta is equal to zero, so there is only one solution to the equation
Stosujemy wzór:$x=\frac{-b}{2a}=\frac{8}{4}=2$
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