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Answer:
a) a²+b²-ab
=4²+(-5)²-(4×-5)
=16-25+20
=36-25
= 9
b) a²b + ab²
= 4²×-5+ 4×-5²
=16×-5+4×25
= -80+100
= 20
c) 4-(-5) + 4-(-5)
4+(-5)
= 4+5 + 4+5
4-5
= 9 + 9
-1
=. -9 +9
1
= 0/1
=0
d) (a+b)² -(a-b)²
= (4)²+(-5)²+2×4×-5 - (4)²+(-5)²-2×4×-5
=16+25 -40 - (16+25-40)
=16+25-40 -16-25+40(all cancelled)
=0
Hope This Helps You
With Regards
@shivamjha29
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