Find the product:
`( 3/ 4 x + 4/5 y) ( 4/5 x - 1/7 y)`

Find the products: (4x-5y)(16 x^2+20 x y+25 y^2)

Find the product of : 4x^(2) - 5y^(2) and 3x^(2) +2y^(2)

Find the following products: (i) 7/5x^2y(3/5x y^2+2/5x) (ii) 4/3a(a^2+b^2-3c^2)

Find the products: (i) (2x+y)(2x-y)(4x^2+y^2) (ii) (x-y/5-1)\ (x+y/5+1)

Find the product \ 3y(x y+y^2) and find its value for x=4\ a n d\ y=5.

Find each of the products: (0. 5 x)xx(1/3x y^2z^4)xx\ (24 x^2y z)

Evaluate : (viii) (7x + 15y) ( 5x - 4y)

Find the following products: (i) (x+2)(x+3) (ii) (x+7)(x-2) (iii) y-4)(y-3) (iv) (y-7)(y+3) (vi) (2x-3)(2x+5) (vii) (3x+4)(3x-5)

Determine the product [(-4, 4, 4),(-7, 1, 3),( 5,-3,-1)][(1,-1, 1),( 1,-2,-2),( 2, 1, 3)] and use it to solve the system of equations: x-y+z=4,\ \ x-2y-2z=9,\ \ 2x+y+3z=1.

Use the identity (x+a)(x+b)=x^2+(a+b)x+ab to find the following products. (i) (x+3)(x+7) (ii) (4x+5)(4x+1) (iii) (4x+5)(4x+1) (iv) (4x+5)(4x-1) (v) (2x+5y)(2x+3y) (vi) (2a^2+9)(2a^2+5) (vii) (xyz-4)(xyz-2)