If a = 2, b = - 2, find the value of : (i) a 2 + b 2 (ii) a 2 + ab + b 2 (iii) a 2 - b 2

Question

Philoid · Accepted Answer

(i) a² + b²

Put a = 2 and b = -2

=(2)² + (-2)²

=4 + 4

=8

(ii) a² + ab + b²

Put a = 2 and b = -2

= (2)² + 2(-2) + (-2)²

= 4 - 4 + 4

= 4

(iii)a² (- b²

=Put a = 2 and b = -2

=(2)² - (-2)²

= 4 - 4

= 0