Question

Q) 28
29
30
And please

Answer 1

Answer:

Step-by-step explanation:

in question 28 substitute x=a,x=b and x=c

therefore you get three equations

which is useful in finding answer

in question 29 hcf is defined as common factors with least multiples

you take p=6,q=6 and r=6 because of above defination

therefore p+q-r=6+6-6=6

in question 30

put x+1=0,x+2=0 and x+3=0

you will get the values of each x

and substitute the values of in given equation ax^2+bx+c=0

you substitute the value of each x and  substitute in above by that you get 3 equations and put respective equation = respective remainder