Algebra-1

Given the expression 4x² + 15x + 9, we have:
a = 4
b = 15
c = 9

We need to find two numbers m and n such that their product is ac (4 * 9 = 36) and their sum is b (15).

The numbers that satisfy these conditions are 3 and 12:

m = 3
n = 12

Now, let's rewrite the middle term (15x) using these values:
15x = 3x + 12x

Now we ...