Question

(4.2)square using identity

Answer 1

Answer:

1762

Step-by-step explanation:

(4.2)^2=4.2×4.2

= 1762

Answer 2

Answer:

(4.2)²=(4+0.2)²

(a+b)²=a²+b²+2ab

=4²+(0.2)²+2(4)(0.2)

=16+0.04+1.6

=17.64