Factor trinomial 15x^2-43x+8?

Question

Keith A · Answer

4 * 8 = 40
Add  3:  43     v
   15x^2 - 43x + 8
= (5x - 1) (3x - 8)

DWRead · Answer

Use the quadratic formula to find the roots
x = [43 ± √(43² – 4·15·8)] / [2·15]
 = [43 ± √1369] / 30
 = [43 ± 37] /30
 = ⅕, 2⅔

15x² - 43x + 8 = 15(x - 2⅔)(x - ⅕)
= 3(x-2⅔) 5(x-⅕)
= (3x - 8) (5x - 1)

Alex · Answer

15*8=120
15x^2-3x-40x+8
-40x+8=8(-5x+1)
15x^2-3x=-3x(-5x+1)
(8-3x)(-5x+1)

(8-3x)(-5x+1)

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