Answer:
The product of (a+b)(a-b) is 
Step-by-step explanation:
Use FOIL to explain how to find the product of (a + b)(a − b)
FOIL is
Multiply First terms : a*a = a^2
Multiply Outside terms : a* -b = -ab
Multiply Inner terms : b * a= ab
Multiply last terms : b * -b = -b^2
now we combine all the terms

combine like terms

The product of (a+b)(a-b) is 
Shortcut is we apply an identity

The answer is c u welcome
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Answer:
volume of old tank=20×4×10=800m³
no of shark adjust =800/25=32 sharks is adjusted in old shark tank
for new
if length=25℅0f 20+20=25m
breadth=25%of 4 +4=1+4=5m
height is same=10m
new volume =25×5×10=1250m³
total no.of shark adjust=1250/25=50 shark
50-32=18 more shark that the new tank hold.
- 5g - 6
as g= -2
-5 (-2) -6
10-6
4 is the answer