Question

Find the value of the expression 2m² - 3mn² - 8 and if m= -2 and n=3

Answer 1

2(-2)² - 3(-2)3²-8
2×4+6×9-8
8+54-8
54

Answer 2

m=-2
m²=4
n=3
n²=9
2m²-3mn²-8
= 2×4-(3×(-2)×9)-8
=8+54-8
=62-8
=54