Question

Tính giá trị biểu thức B=b^2-8b-c(8-b) tại b=108; c=-8

Answer 1

\(B=b^2-8b-c\left(8-b\right)\)

\(=b\left(b-8\right)+c\left(b-8\right)\)

\(=\left(b-8\right)\left(b+c\right)\)

\(\left(108-8\right)\left(108-8\right)=100.100=10000\)

Answer 2

\(B=b^2-8b-c\left(8-b\right)\)

\(=b\left(b-8\right)+c\left(b-8\right)\)

\(=\left(b-8\right)\left(b+c\right)\)

\(=100\cdot100=10000\)