Question

6. Expand-x+2y + 4zy using suitable idenfities.
7.fa) Simplify -
21x2
8. Rationalize the denominator
(hy fat​

Answer 1

Answer:

42

Step-by-step explanation:

(a+b)2=A2 +2ab+b2

(20+1)2=20(2)+2(20+1)+1(2)

42=40+42+2

42=84

=84-42

=42

for checking

multiply 21*2=42