Verified answer

(a+b)²=a²+2ab+b²

(2+4)²=2²+2*2*4+4²=4+16+16=36

(a-b)²=a²−2ab+b²

(4-3)²=4²-2*4*3+3²=16-24+9=1

(a+b)³=a³+3a²b+3ab²+b³

(5+4)³=5³+3*5²*4+3*5*4²+4³=125+300+240+64=729