Simplify the expression:

a.

b^2+49 - (b-7) ^2

b.

2a+6b) ^2-24ab

Part a b2+49 - (b-7) 2

Distribute:

=b2+49+-b2+14b+-49

Combine Like Terms:

=b2+49+-b2+14b+-49

= (b2+-b2) + (14b) + (49+-49)

=14b

Answer:

=14b

part b

(2a+6b) 2-24ab

Distribute:

=4a2+24ab+36b2+-24ab

Combine Like Terms:

=4a2+24ab+36b2+-24ab

= (4a2) + (24ab+-24ab) + (36b2)

=4a2+36b2

Answer:

=4a2+36b2