Question

find the product (0.7x+0.9y) (0.49x^2-0.63xy+0.81y^2​

Answer 1

Step-by-step explanation:

(0,. 7x+0. 9y){(0. 7x)ˆ2-(0. 7x)(0. 9y)+(0. 9y)ˆ2}

$(a+b)( {a}^{2}-ab + {b}^{2})= {a}^{3} + {b}^{3}$

=(0. 7x)ˆ3+(0. 9y)ˆ3

=0. 343xˆ3+0. 729yˆ3