Question

Which algebraic expression is equivalent to the expression below?
9(8x + 10) + 9(9 - x)

A. 63x - 171
B. 81x + 171
C. 63x + 9
D. 63x + 171

Answer 1

9*8x = 72
9* 10 = 90

so far, 72x + 90 + 9(9-x)

9 * 9 = 81
9 * -x = -9x

now, we have: 72x + 90 + 81 -9x

Now we can simplify by combining like terms

72x - 9x = 63x
90 + 81 = 171

63x + 171 is our answer
The answer is B.


Hope I helped!
Let me know if you need anything else!
~ Zoe