What's the product of these binomials (x-9) (x+2)

Question

asked Apr 6, 2016 217k views

2 Answers

Dendog · Answer 1 · 2016-04-10T17:38:53+0000

Answer:

(x-9)*(x+2)=x^2 - 7x -18

Explanation:

Let's find the solution, but first we need to understand the following:

multiplication of binomials establish that:

(a-b)*(c+d)=(a*c) + (a*d) + ((-b)*(c)) + ((-b)*(d))

now, because your binomials are (x-9) and (x+2), using the above we obtain:

(x-9)*(x+2)=(x*x) + (x*2) + ((-9)*x) + ((-9)*2)

which can be simplified as:

(x-9)*(x+2)=x^2 + 2x - 9x -18

giving the solution:

(x-9)*(x+2)=x^2 - 7x -18