evaluate using identities 30³+20³-50³
Answers
Answered by
1
Answer: -90000
Step-by-step explanation:
30³ + 20³ - 50³
= 27000 + 8000 - 125000
= 35000 - 125000
= -90000
30³ + 20³ - 50³
(3*10)³ + (2*10)³ - (5*10)³
= 27*10³ + 8*10³ - 125*10³
= 10³(27 + 8 - 125)
= 1000(-90)
= -90000
30³ + 20³ - 50³
a³ + b³ = (a +b)³ - 3ab(a+b)
a = 30
b = 20
= (30 + 20)³ - 3(30)(20)(30 + 20) - 50³
= 50³ - 1800(50) - 50³
= -90000
Answered by
0
Answer:
30³+20³+(-50)³
a³+b³+c³ = 3abc if a+b+c = 0
30+20+(-50)
50-50
=0
So,
30³+20³-50³
= 3(30)(20)(-50)
= -90,000
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