if (x + 3)(x -2) = 1

Question

show that x^2 + x -7 = 0

Answer 1

Multiply out the (x + 3)(x -2), giving you

x^2 +x -6 = 1 ,

and then subtract 1 from both sides of that equation. You will get you the equation that you want to prove.

That proves it is true

Answer 2

thanks