Question

Find the following squares by using the identities.
(i) (b – 7)2

Answer 1

i) (b−7)2

=b2+72−2(b)(7)

=b2+49−14b                 ∵[(a−b)2=a2+b2−2ab]

Answer 2

Answer:

$( {b}^{2} ) + ( {7}^{2} - 2(b)(7) \\ {b}^{2} + 49 - (2 \times 7) \times b \\ {b}^{2} + 49 - 14b$