find the value of the given expressions, if l =1 , m = -1 and n = 0.
please explain step by step
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Given
l = 1
m = -1
n = 0
1. n² - 4m² + lm - m² - 2ml
= 0² - 4× -1² + 1×-1 - 2× -1×1
= 0- 4×1 + -1 - 2×-1
= 0 - 4 - 1 + 2
= 0 - 5 +2
= -3
2. 2m² - 2n² -4 - m² +3
= 2× -1² - 2× 0² -4 - (-1)² +3
= 2× 1 - 0 -4 -1 +3
= 2-0 -2
=0
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