L 1.2.3 Quiz: Algebraic Properties and Expressions Question 2 of 10
If d = the number of dogs, which variable expression represents the phrase
below?
the sum of the number of dogs and the 6 cats
O
A. d.6
O
B. d - 6
O c. d=6
D. d + 6

Notice you have the square of x^3 + 1 in the first term, and x^3 + 1 in the second term. think of x^3 + 1 as just a variable, such as u.let u = x^3 + 1.now when you write the equation in terms of u, it is a quadratic equation in u.16u^2 - 22u - 3 = 0answer: let u = x^3 + 1