" (20) "5a^(2)-20ab

If a = 2 and b = 3, find the value of (i) a + b (ii) a^(2) + ab (iii) ab - a^(2) (iv) 2a - 3b (v) 5a^(2) - 2ab (vi) a^(3) - b^(3)

Factorize (i) 5a^2-20ab (ii) 36a^3b-60a^2bc (iii) 5a(b+c)-7b(b+c) (iv) 6(2a+3b)^2-8(2a+3b)

Divide : ( 20a^(2) - 15 ab + 45a ) by (5a)

If 8a^(2)+50b^(2)+98c^(2)-20ab-70bc-28ac=0 then show that 2a=5b=7c

Simplify (5a-2b) (25a^(2)+10ab+4b^(2)_) -(2a+5b) (4a^(2)-10ab+25b^(2)).

Simplify : 6a^(2)+3ab+5b^(2)-2ab-b^(2)+2a^(2)+4ab+2b^(2)-a^(2) .

Factoris the expression. 4 ab ^(2) - 3a ^(2) b + 5 ab ^(2) -ab

Factorise: 15ab ^(2) - 20 a ^(2)b

Subtract: 5a^(2) - 7ab + 5b^(2) "from" 3ab - 2a^(2) - 2b^(2)