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by special product

(x+y)²=x²+2xy=y²

x = b

y = 4a

by substitution

(b+4a)² = b²+2(b)(4a)+(4a)²

(b+4a)² = b²+8ba+16a²

answer is b²+8ba+16a²

1. Square the first term

2. multiply the exponent to the product inside the quantity: TAKE NOTE: the sign would depend.

3. square the last term.

for example:

a. (b+4a)

1. b^2

2. 2(4a*b) = 8ab

3. (4a)^2 = 16a^2

ANSWER: (b^2+8ab+16a^2)