Answer:
DB = 82
Step-by-step explanation:
3x + 8 + 4x + 10 = 8x
7x + 18 = 8x
18 = 8x - 7x
18 = x
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DB: 4x + 10
4 (18) + 10 = 82
B
Any number with ^ means the power of [said number]. You would times the number by how much is said ( times it by it’s self)
The equation which is supposed to help you is this one:
a^2 - b^2 = (a+b) (a-b)
So, what we need to do here is apply this equation:
k^2 - 9h^2 =
k * k - (3h)^2 =
(k + 3h) (k-3h)
The correct answer is C.