Question

solve (x+3)(x+4)=0

Answer 1

x=-3 ; x=-4

Answer 2

let each of the brackets equal to 0 in the equation

Answer 3

something¹ x something² is equal zero if
something¹ is equal zero or
something² is equal zero

Answer 4

valid for as many somethings there can be

Answer 5

oh, and it is' and/or'
one can be, other can be or both