If `x^2-hx - 21 =0` , ` x^2 - 3hx +35 =0` have a common root then h=

If x^2 -hx - 21 = 0 and x^2 - 3hx + 35 =0 ( h gt 0) have a common roots, then h =…………..

If x ^(2) - hx - 21 =0, x ^(2) - 3 hx + 35 =0 (h gt 0) has a common root, then the value of h is equal to

IF x^2-4x+3=0,x^2-5x+k=0 have a common root, then k

If x^2 + bx + ca =0 , x^2 + cx +ab =0 have a common root then their other are the roots of the equation

IF x^2 + a x + bc = 0 and x^2 + b x + c a = 0 have a common root , then a + b+ c=