Решите 435 2) 2x*x-7x-4=0 4) 3x*x+2x-1=0 8) -3x*x-x+4=0 436 2) 16x*x-8x+1=0 4)...

Question

Решите
435
2) 2x*x-7x-4=0
4) 3x*x+2x-1=0
8) -3x*x-x+4=0
436
2) 16x*x-8x+1=0
4) 36x*x+12x+1=0

Answer 1

2)D=(-7)^2-4*2*(-4)=49+32=81 ;х=7+9/4=4. 7-9/4= -0,5
4)D=4-4*3* (-1)= 4+12=16
х=-2-4/6= -1; -2+4/6=1/3