BASIC ALJEBRA FORMUAE
1) (a+b)¹ =a +b
2) (a+b)² =a² +2ab +b²
3) (a-b)² =a² -2ab +b²
4) (a+b)³ =a³ +3a²b+3ab²+b³
5)(a-b)³ =a³-3a²b+3ab²-b³
6)(a+b)⁴=a⁴+4a³b¹ +6a²b² +4a¹b³ +b⁴
7)(a+b)⁵=a⁵+5a⁴b¹+10a³b²+10a²b³+5a¹b⁴+b⁵
8) (a²-b²) =(a+b) (a-b)
9) (a+b)(a-b) =a²-b²
10) (a³+b³) =(a+b) (a²-ab+b² )
11) (a³-b³) = (a-b) (a²+ab+b² )
12)(a+b+c)² =a²+b²+c²+2ab+2bc+2ca
13) (a+1/a)² = a²+2+1/a²
.i.e a²+1/a² = (a+1/a)²-2
14) (a-1/a)² =a²-2+1/a²
i.e. a²+1/a² = (a-1/a)² +2
15) (a+1/a)³ = a³+3a+3.1/a+1/a³
16) (a+b)²-2ab =a²+b²
17) (a+b)² - 4ab = (a-b)²
18) (a-b)² +4ab= (a+b)²
19) (x +a) (x+b) =x (x+b) +a (x+b)
= x² +x.b +a.x+a.b
20) (x +a) (x-b) = x (x-b) +a (x-b)
=x² - x.b + a.x - a.b
21) (x-a) (x+b) = x (x+b) - a(x+b)
=x² +x.b - a.x - a.b
22) (x-a) (x-b) = x (x-b) -a (x-b)
= x² - x.b - a.x + a.b
READ THE BLOG ON ANGLE & IT'S TYPE
Laws of Indices :
1) (a.b)ⁿ=aⁿ.bⁿ (Power is common base is different)
2) aⁿ. aⁱ= aⁿ⁺ⁱ (Base is same power is different)
3) 1/aⁱ = a⁻ⁱ
3) aⁿ/aⁱ =aⁿ➗ aⁱ = aª⁻ⁱ
4) (aⁿ)ⁱ = aⁿⁱ
5)( (aⁿ)ⁱ )ˡ = (a)ⁿⁱˡ
6) aº = 1
7) a¹ = a
8) a⁻ⁿ = 1/ aⁿ
9) (a)¹/ⁿ = n√a e.g. ∜a = (a)¹/4
10) (a)ⁿ/ˡ =1 / (a)ˡ/n
11) (a/b)ⁿ = aⁿ/bⁿ
READ THE BLOG ON " INDIAN RAILWAY "
Note :
1) (-) × (-) = +
2) (-) × (+) = -
3) (+) × (-) = -
4) (+) × (+) = +
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