Решите уравнения: 1) (4x-3)(4x 3)-(4x-1)^2=3x 2) 3(x-1)^2-3x(x-5)=21 3)...

Question

Решите уравнения: 1) (4x-3)(4x 3)-(4x-1)^2=3x 2) 3(x-1)^2-3x(x-5)=21 3) 10(x-2)^2-5x(2x-1)=-4 4)(5x 6)^2-(5x-6)^2=12 5) (3-2x)^2-(2x-2)^2=4 6) (5-3x)^2-17x=3x(3x-2) 12

Answer 1

1) 16x^2+12x-12x-(16x^2 - 8x - 1)=3x 16x^2+12x-12x-16x^2 + 8x + 1-3x=0 5x+1=0 5x=-1 x=-1 : 5 x=-0,2

Comments

2) 3 (x^2 -2x + 1) - 3x^2 +15x =21 

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3x^2 - 6x +3 -3^2 +15 - 21 =0     -6x -3 =0       -6x=3    x= -0,5 

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3)10(x^2 - 4x + 4)+10x^2+5x +4 =0        10x^2 -40x + 40 + 10x^2 + 5x +4 =0    -35x+44=0   -35x= -44  x=-44:(-35)