Question

2x(4x-21)-5x(4+3x)=2(x+1)-1
решите плиз

Answer 1

2x(4x-21)-5x(4+3x)=2(x+1)-1

8x²-42x-20x-15x²=2x+2-1

-7x²-62x=2x+1

-7x²-64x-1=0

7x²+64x+1=0

D=64²-28=4096-28=4068=4×1017,√D=2√1017=2√(9×113)=6√113

x1=(-64+6√113)/14, x1=(-32+3√113)/7

x2=(-64-6√113)/14, x2=(-32-3√113)/7