Expand the following
1) ( 4a - b + 2c )²
2) (3a - 2b)³
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Heya!
Here is yr answer......
1) (4a-b+2c)²
=> (4a+(-b)+2c)²
[ (a+b+c)² = a²+b²+c²+2ab+2bc+2ca ]
=>(4a)²+(-b)²+(2c)²+2(4a)(-b)+2(-b)(2c) +2(2c)(4a)
=> 16a² + b² + 4c² -8ab -4bc + 16ca
2) (3a-2b)³
[ (a-b)³ = a³-3a²b+3ab²-b³ ]
=> (3a)³ -3(3a)²(2b)+3(3a)(2b)²-(2b)³
=> 27a³ -18a²b + 18ab² - 8b³
Hope it hlpz...
Here is yr answer......
1) (4a-b+2c)²
=> (4a+(-b)+2c)²
[ (a+b+c)² = a²+b²+c²+2ab+2bc+2ca ]
=>(4a)²+(-b)²+(2c)²+2(4a)(-b)+2(-b)(2c) +2(2c)(4a)
=> 16a² + b² + 4c² -8ab -4bc + 16ca
2) (3a-2b)³
[ (a-b)³ = a³-3a²b+3ab²-b³ ]
=> (3a)³ -3(3a)²(2b)+3(3a)(2b)²-(2b)³
=> 27a³ -18a²b + 18ab² - 8b³
Hope it hlpz...
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