Topic : Polynomials-Factoring and Expanding
1.
2.
from: category_eng

1.Modification
(x-1)(y-1)=xy-(x+y)+1
(1) xy=x+y then, (x-1)(y-1)=xy-(x+y)+1=1
(2)if x=y, then (x-1)(y-1)=(x-1)^2. Therefore, we don't know if it is same as 1 or not.

Ans: A

2.Modification
(b+c)(a+d)=6

Ans: C

1.

2.
Modification Required!
3.

4.
Modify the given condition to answer for the question.
1. b
Modification
(1) There is no information about the y.
(2) x^2+2y =17, then we can say 2(x^2+2y)=34
2. a
Modification
Modification Required!
2x-6y=2*(x-3y)=-40
3. e
Understanding
4. C
Modification
Modify the given condition to answer for the question.