Question

resolva a equação a) [ × × 3 × ]=4
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Answer 1

| x x | = 4

| 3 x |

x.x - x.3 = 4

x² - 3x - 4 = 0

∆= (-3)² -4.1.(-4)=9+16=25 => √∆=5

x = -b±√∆/2a

x = 3±5/2.1

x' = 3+5/2= 8/2= 4 ✓

x" = 3-5/2 = -2/2= -1 ✓