Question

решите равенство
(4-b)*(b+4)=b^2-16

Answer 1

4b +16 - b^2 - 4b = b^2 - 16
16 - b^2 = b^2 - 16
16 + 16 = b^2 + b^2
32 = 2b^2
b^2 = 16
b = 4