(0.9x+0.7y)(0.81x^(2)-0.63xy+0.49y^(2))

Find the product: (0.9x+0.7y)(0.81x^(2)-0.63xy+49y^(2))

(0.9x+0.7y)(0.81x^2-0.63xy+0.49^2) =………….

Find the product: (0. 9 x+0. 7 y)(0. 81 x^2-0. 63 x y+0.49 y^2)

Find the following products: (i) (0. 9 x+0. 7 y)(0. 81 x^2-0. 63 x y+0. 49 y^2) (ii) ((2x)/5-(3y)/7)((9y^2)/(49)+(4x^2)/(25)+(6x y)/(35))

{:(0.4x + 0.3y = 1.7),(0.7x - 0.2y = 0.8):}

{:(0.4x + 0.3y = 1.7),(0.7x - 0.2y = 0.8):}

Show that the pair of lines 3x^(2)-5xy+2y^(3)=0 9x^(2)-25xy+4y^(2)=0 are equally inclined to each other.

A(4,0),B(-4,0) are two points.The locus of P which moves such that |PA-PB|=6 is (i)9x^(2)-7y^(2)+63=0 (ii) 9x^(2)+7y^(2)-63=0( iii) 9x^(2)+7y^(2)+63=0 (iv) 9x^(2)-7y^(2)-63=0

The figure formed by the pairs of lines 3x^(2)+10xy+3y^(2)=0 and 3x^(2)+10xy+3y^(2)-28x-28y+49=0 is a

The figure formed by the four lines 3x^(2)+10xy+3y^(2)=0 and 3x^(2)+10xy+3y^(2)-28x-28y+49=0