16Hit1600
Advanced MathMediumCoefficient after expanding two products

Advanced Math practice question

For all values of x, 2x(x − 3) − x(x + 1) = x² + kx, where k is a constant. What is the value of k?

Answer: -7

2x² − 6x − x² − x = x² − 7x.

Common wrong answers

If you answered 7
7 has the sign wrong.
If you answered -5
−5 forgets the −x from the second product.
If you answered -6
−6 uses only the first product's x term.

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