Question

What is the standard form of # y=(9x+3)( 3x+9) #?

Answer 1

`27x^2+90x+27`

Explanation:

each term in 2nd factor must be multiplied by each term in the 1st factor.
so (9x+3)(3x+9)
=9x(3x+9) +3(3x+3)
`=27x^2 +81x + 9x + 27`
`=27x^2 + 90x + 27`