Question

Find the product (0.9x+0.7y)(0.81x²-0.63xy+0.49y²)

Answer 1

QUESTION:

Find the product (0.9x+0.7y)(0.81x²-0.63xy+0.49y²)

ANSWER:

LET

0.9x=a

and

0.7y=b

WE HAVE TO FIND OUT

(0.9x+0.7y)(0.81x²-0.63xy+0.49y²)

=(0.9x+0.7y)[(0.9x)²-(0.9x×0.7y)+(0.7y)²]

=(a+b)[a²-ab+b²]

=a³+b³

BECOZ WE KNEW THAT a³+b³=(a+b)[a²-ab+b²]

SO OUR ANSWER IS

(0.9x)³+(0.7y)³

=0.729x³+0343y³

HOPE IT HELPS ❤️

MARK IT BRAINLIEST ❤️

Answer 2

Answer:

0.729x³+0343y³