Odpowiedź:
P = 0,5*( x + 5)*( 3 x -2)*sin 45° = 4√2
0,5*( 3 x² - 2 x + 15 x - 10)*0,5√2 = 4√2 / :√2
0,25*(3 x² + 13 x - 10 ) = 4 / * 4
3 x² + 13 x - 10 = 16
3 x² + 17 x - 26 = 0
Δ = 17² - 4*3*(-26) = 289 + 312 = 601
√Δ = [tex]\sqrt{601}[/tex]
x = [tex]\frac{ - 17 - \sqrt{601} }{6}[/tex] < - 6 - odpada
lub x = [tex]\frac{-17 + \sqrt{601} }{6}[/tex] ≈ [tex]\frac{-17 + 24,5153}{6} = \frac{7,5153}{6}[/tex] ≈ 1,253
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Odpowiedź:
P = 0,5*( x + 5)*( 3 x -2)*sin 45° = 4√2
0,5*( 3 x² - 2 x + 15 x - 10)*0,5√2 = 4√2 / :√2
0,25*(3 x² + 13 x - 10 ) = 4 / * 4
3 x² + 13 x - 10 = 16
3 x² + 17 x - 26 = 0
Δ = 17² - 4*3*(-26) = 289 + 312 = 601
√Δ = [tex]\sqrt{601}[/tex]
x = [tex]\frac{ - 17 - \sqrt{601} }{6}[/tex] < - 6 - odpada
lub x = [tex]\frac{-17 + \sqrt{601} }{6}[/tex] ≈ [tex]\frac{-17 + 24,5153}{6} = \frac{7,5153}{6}[/tex] ≈ 1,253
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Szczegółowe wyjaśnienie: