निम्निलिखित समीकरणों को हल कीजिये:
(a) `2(x+4)=12`, (b) `3(n-5)=21`, (c) `3(n-5)=-21`, (d) `-4(2+x)=8`, (e) `4(2-x)=8`

(b) 3(n-5)=21 , (And) 4(2-x)=8

Solve the following equations: (a) 2(x+4)=12 (b) 3(n-5)-21 4) "-4(2+x)=8," (c) "4(2-x)-21],

n/2 - (3n)/4 +(5n)/6 = 21

If (3^(2x-8))/(225)=(5^3)/(5^x) , then x= (a) 2 (b) 3 (c) 5 (d) 4

If 2x=3y\ a n d\ 4y=5z , then x : z= (a) 4:3 (b) 8: 15 (c) 3:4 (d) 15 :8

If 4x+5y=83 and (3x)/(2y)=(21)/(22), then y-x=?( a) 3( b) 4 (c) 7 (d) 11

If n/2 - (3n)/4 + (5n)/6 = 21 , then n = ?

If (3^(2x-8))/(225)=(5^(3))/(5^(x)), then x=2( b) 3(c)5(d)4

{:( "Column" A ,, "Column" B) , ("If" a^(2) - b^(2) = 16 "and" a- b = 2 "," "then" a + b,, "(a)" 3x^(2) - x - 11), ("The degree of " (x-a) (x-b) (x - c) (x-d) ,, "(b)" 3x^(2) - x + 5), (4x^(2) + 20xy + 25y^(2) ,, (c) 8), ((5x^(2) + 7x -3)- (2x^(2) + 8x -8) ,, (d) 4), (,, (e) (4x + 5y) (x+ 5y)), (,,(f) (2x + 5y)^(2)):}

21. If lim_(xrarroo) e^(x^2) - cosx / (sin^2x) is equal to (a) 3 (b) 3/2 (c) 5/4 (d) 2