if a-b=7 a²+b²=84 a³-b³=?
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(a-b)²= 49
a² - 2ab +b² = 49
84 -2ab = 49
- 2ab = -35
ab = 17.5
now a³-b³ = (a-b)(a²+ab+b²)
= 7*(84+ 17.5)
= 7* 101.5
= 710.5
a² - 2ab +b² = 49
84 -2ab = 49
- 2ab = -35
ab = 17.5
now a³-b³ = (a-b)(a²+ab+b²)
= 7*(84+ 17.5)
= 7* 101.5
= 710.5
Incredible29:
thnx pakhi for ² info.
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