Question

28^2-104.96+72^2+28.144

Answer 1

\(28^2-104\cdot96+72^2+28\cdot144\\ =\left(28^2+2\cdot28\cdot72+72^2\right)-9984\\ =\left(28+72\right)^2-9984=100^2-9984=10000-9984=16\)

Answer 2

\(28^2-104\cdot96+72^2+28\cdot144\)

\(=28\left(28+144\right)-96\left(54-104\right)\)

\(=28\cdot172-96\cdot\left(-50\right)\)

\(=9616\)