Your answer is D for your purposes
Work:
Multiply b and 5
Multiply b and 1
The b just gets copied along.
5*b evaluates to 5b
Multiply b and 6
Multiply b and 1
6*b evaluates to 6b
6*b-10 evaluates to 6b-10
Multiply 5b by 6b-10
Multiply 5b by each term in 6b-10 term by term.
This is the distributive property of multiplication.
Multiply 5b and 6b
Multiply the b and b
Multiply b and b
Combine the b and b by adding the exponents, and keeping the b, to get b²
5b × 6b =
Multiply 5b and -10
Multiply b and 1
5b × -10 = -50b
5*b*(6*b-10)
***The final answer is 30b²-50b***
