Question

Expand (7x - 9y)³


It's very urgent ​

Answer 1

Answer:

343x^2 - 1323x^2y + 1701xy^2 - 729y^3

Step-by-step explanation:

(7x-9y).(97x-9y).(7x-9y)

(7x+-9y)(49x^2+-126xy + 81y^2)

(7x)(49x^2) + (7x)(-126xy)+(7x)(81y^2) + (-9y)(49x^2) + (-9y)(-126xy) +(-9y)(81y^2)

343^3 - 882x^2y + 567xy^2 - 441x^2y +1134xy^2 - 729y^3

343x^2 -1323x^2y + 1701xy^2 - 729y^3