Question

Помогиле решить (7+(b×b))×(7+(b×b))

Answer 1

$(7+(b*b))*(7+(b*b))=(7+b^2)(7+b^2)=(7+b^2)^2=$
$=(7)^2+2*7*b^2+(b^2)^2=49+14b^2+b^{2*2}=b^4+14b^2+49$