Section: Math Section 1

17) For all values of x, (3x + 4) (4x - 3) =

1. 7x+1
2. 7x-12
3. 12x²+7x-12
4. 12x²-25x-12
5. 12x²-12

Use FOIL:

(3x + 4)(4x - 3)
= (3x * 4x) + [3x * (-3)] + (4 * 4x) + [4 * (-3)]
= 12x² - 9x + 16x - 12
= 12x² + 7x - 12