math
posted by pavleen .
what is the product of (x+4)and (x5)
j

4x(x  5)  5x(x  4) = 1
4x*x  4x*5  5x*x  5x*4 = 1
4x^2  20x  5x^2 + 20x = 1
x^2 = 1
x^2 = 1
x = 1, x = 1
So the answer is x = 1 or x = 1.
I hope that helps! :)