What is the value of 3x² - x + 4 when x = -1?

3(1) - (-1) + 4 = 3 + 1 + 4 = 8.

Which expression represents 'six less than twice a number n'?

'Twice a number' is 2n, and 'six less than' means subtract 6, giving 2n - 6.

Distribute the -2: 5x - 6 + 2x = 7x - 6.

x² - 9 is a difference of squares: (x+3)(x-3).

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Simplify: (2x + 3)(x - 4)