Question

Polynomial standard form (9 + m)(-m + 9)

Answer 1

Answer: -m^2+81

I used the foil method

(9+m)(-m+9)

first: 9*-m=-9m

second: 9*9=81

third: m*-m=-m^2

forth: m*9= 9m

then you do this: -9m+81-m^2

+9m

------------------

81-m^2

then you set at the decending powers of x. which will give you: -m^2+81

Answer 2

Explanation:

(9 + m)(-m + 9) = (9 + m)(9 - m) {(a+b)(a-b) = a² - b²}

= 9² - m²

= 81 - m²

= -m² + 81