3 years ago

Help with 14, 15, and 16 please ?

1 answer:

4 0

14. 36x^2 - 16
4(9x^2 - 4) =
4(3x + 2)(3x - 2) <==

15. 3x^2 + 10x - 8
(3x - 2)(x + 4) <==

16. 5x^2 - 16x + 15 = 4x - 5
5x^2 - 16x - 4x + 15 + 5 = 0
5x^2 - 20x + 20 = 0
5(x^2 - 4x + 4)
5(x - 2)(x - 2)
x - 2 = 0....x = 2

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