Set it up as a propotion and cross multiply. 10/23=15/x answer is 34.5
(3x - 2)^2 is the same as:
(3x - 2)(3x - 2)
use the FOIL method: First, Outside, Inside, Last
3x(3x) = 9x²
3x(-2) = -6x
-2(3x) = -6x
-2(-2) = 4
9x² - 6x - 6x + 4
Combine like terms
9x² (- 6x - 6x) + 4
9x² - 12x + 4 is your answer
hope this helps
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