First slide
Theory of equations
Question

Suppose a,b,cIsuch that the greatest common divisor of x2+ax+b and x2+bx+c is (x+1)and the least common multiple of x2+ax+b and x2+bx+c is x34x2+x+6.Then the value of 10 abc is equal to ______.

Moderate
Solution

x2+ax+b=(x+1)(x+b)b+1=a    (1)
Also,  x2+bx+c=(x+1)(x+c)c+1=b
or            b+1=c+2                             (2)
Hence   b+1=a=c+2
Also   (x+1)(x+b)(x+c)=x34x2+x+6
    x3+(1+b+c)x2+(b+bc+c)x+bcx34x2+x+6    1+b+c=4    2c+2=4c=3;b=2 and a=1    10abc=60

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