(a-4b)(4b+a) при a=1.2, b=-0.6

Question

(a-4b)(4b+a) при a=1.2, b=-0.6

Answer 1

(1.2-4×(-0.6))×(4×(0.6)+1.2)= 3.6×(-1.2)=-4.32

Answer 2

(a-4b)(a+4b)=a²-4b²=1.44-4·0.36=1.44-1.44=0