Simplify the expression and find its value when and `a= 5 and b = -3` . `2 ( a^2 + ab ) + 3 - ab.`

Simplify the expression and find its value when a =5 and b=-3 then 2(a^2+ab)+3-ab

Simplify the following expression and then find its value when a = 2 and b = - 1 : 2(a^(2) - b^(2)) - [ 2a^(2) - { b^(2) - (a^(2)+b^(2) +ab)}]

Simplify these expressions and find their values if x=3, a-1 and b=-2 (i) 3x-5-x+9

If a+b = 5 and ab = 6 , find a^2 + b^2

Find the value of the expression: a^2-ab-2a+5b when a=2 and b=-3

State true or false : The value of ab is 8 when a = 3 and b = 2.

Simplify the following expressions : 2/3 (3a+ 6b ) - 5a - 2/5 b

If a+ b=5 and ab= 6 , find a^3 + b^3 .

Simplify the following expressions. (5^(2))^(3)

Find the value of : 3ab + 4bc - 5ca when a = 4, b = 5 and c =-2