Simplify (8x2 − 1 + 2x3) − (7x3 − 3x2 + 1). i don't understand what i'm doing wrong.

Did you distribute the negative 1 across the second term?

8x^2-1+2x^3-7x^3+3x^2-1

The answer should be -5x^3 + 11x^2

first, we define the variables:

x: number of years after 1950

f (x): amount of vinyl sold.

then, with the variables defined, we have:

68594 vinyl records were sold in 1958 > f (8) = 68594

91299 vinyl records were sold in 1961 > f (11) = 91299

38720 vinyl records were sold in 1952 > f (2) = 38720

161743 vinyl records were sold in 1967 > f (17) = 161743

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step-by-step explanation: