Question

помогите решить!!!!​

Answer 1

Ответ:

Объяснение:

$\frac{4x^{2} +x}{3} -\frac{x^{2}+17 }{9} =\frac{5x-1}{6} |*18\\6*(4x^{2} +x)-2*(x^{2} +17)=3*(5x-1)\\24x^{2} +6x-2x^{2} -34=15x-3\\22x^{2} -9x-31=0\\D=2809;\sqrt{D}=53\\x_{1} ==1;x_{2} =\frac{31}{22}.$

A)

$10x^{2} +4x+b=0\\D=4^{2} -4*10*b=16-40b=0\\16-40b=0\\40b=16 |:40\\b=0,4.$      

Б)

$2x^{2} +bx+8=0\\D=b^{2} -4*2*8=0\\b^{2}-64=0\\b^{2} =64\\b_{1,2} =\frac{+}{-} 8.$