Question

In the case find whether the trinomial is a perfect square or not:

x² - 4x + 16 

Answer 1

x² - 4x + 16 

= (x)² - x × 4 + (4)²

= a - ab + b²

...[Taking x = a, and 4 = b]

∴ The given trinomial cannot be expressed as a² - 2ab + b². Hence, it is not a perfect square.