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jawabannya:
A= 1 B= -5 C= 4
X₁,₂ = -B ±√B² - 4AC
2A
= - (-5) ± √-5² - 4.1.4
2.1
= 5 ± √25 - 16
2
= 5 ± √9
2
= 5 ± 3
2
X₁ = 5 + 3
2
= 4
X₂ = 5 - 3
2
= 1
jadi himpunan penyelesaiannya (1, 4)