Question

(y2+b)²=

 

(7x²+3)³=

 

(a+2b)²=

 

 

Answer 1

$\boxed{(y^2+b)^2=y^4+2by^2+b^2}$

$\boxed{(7x^2+3)^3=(7x^2+3)(49x^4+42x^2+9)=343x^6+441x^4+189x^2+27}$


$\boxed{(a+2b)^2=a^2+4ab+4b^2}$