(x-5)(x-4)
Expanding the expression (x-5)(x-4) gives:
x * x + x * (-4) + (-5) * x + (-5) * (-4)
Simplifying this gives:
x^2 - 4x - 5x + 20
Combining like terms gives the final result:
x^2 - 9x + 20
x * x + x * (-4) + (-5) * x + (-5) * (-4)
Simplifying this gives:
x^2 - 4x - 5x + 20
Combining like terms gives the final result:
x^2 - 9x + 20