Silahkan dilihat difoto ya penyelesaiannya
[tex]g(x) = {x}^{2} + px + q[/tex]
- - -
[tex]g(3) = {3}^{2} + p(3) + q[/tex]
[tex] - 8 = 9 + 3p + q[/tex]
[tex] - 17 = 3p + q[/tex]
[tex]3p + q = - 17 \: ....(1)[/tex]
[tex]g( - 2) = {( - 2)}^{2} + p( - 2) + q[/tex]
[tex]7 = 4 - 2p + q[/tex]
[tex]3 = - 2p + q[/tex]
[tex] - 2p + q = 3 \: ....(2)[/tex]
eliminasi persamaan (1) dan (2)
[tex]3p + q = - 17[/tex]
[tex] - 2p + q = 3[/tex]
___________________ -
[tex]5p = - 20[/tex]
[tex]p = \frac{ - 20}{5} [/tex]
[tex]p = - 4[/tex]
substitusi p = -4 ke persamaan (1)
[tex]3( - 4) + q = - 17[/tex]
[tex] - 12 + q = - 17[/tex]
[tex]q = 5[/tex]
nilai p = -4 dan q = 5
substitusi p = -4 dan q = 5 ke persamaan g(x)
[tex]g(x) = {x}^{2} + ( - 4)x + (5)[/tex]
[tex]g(x) = {x}^{2} - 4x + 5[/tex]
[tex] = g( - 6) + g( 4)[/tex]
[tex] = ( {( - 6)}^{2} - 4( - 6) + 5) + ( {(4)}^{2} - 4(4) + 5) \\ [/tex]
[tex] = (36 + 24 + 5) + (16 - 16 + 5)[/tex]
[tex] = (65) + (5)[/tex]
[tex] = 70[/tex]
nilai g(-6) + g(4) adalah 70
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Verified answer
Silahkan dilihat difoto ya penyelesaiannya
[tex]g(x) = {x}^{2} + px + q[/tex]
- - -
[tex]g(3) = {3}^{2} + p(3) + q[/tex]
[tex] - 8 = 9 + 3p + q[/tex]
[tex] - 17 = 3p + q[/tex]
[tex]3p + q = - 17 \: ....(1)[/tex]
- - -
[tex]g( - 2) = {( - 2)}^{2} + p( - 2) + q[/tex]
[tex]7 = 4 - 2p + q[/tex]
[tex]3 = - 2p + q[/tex]
[tex] - 2p + q = 3 \: ....(2)[/tex]
- - -
a. nilai p dan q
eliminasi persamaan (1) dan (2)
[tex]3p + q = - 17[/tex]
[tex] - 2p + q = 3[/tex]
___________________ -
[tex]5p = - 20[/tex]
[tex]p = \frac{ - 20}{5} [/tex]
[tex]p = - 4[/tex]
- - -
substitusi p = -4 ke persamaan (1)
[tex]3( - 4) + q = - 17[/tex]
[tex] - 12 + q = - 17[/tex]
[tex]q = 5[/tex]
nilai p = -4 dan q = 5
- - -
b. bentuk fungsi g
substitusi p = -4 dan q = 5 ke persamaan g(x)
[tex]g(x) = {x}^{2} + ( - 4)x + (5)[/tex]
[tex]g(x) = {x}^{2} - 4x + 5[/tex]
- - -
c. nilai g(-6) + g(4)
[tex] = g( - 6) + g( 4)[/tex]
[tex] = ( {( - 6)}^{2} - 4( - 6) + 5) + ( {(4)}^{2} - 4(4) + 5) \\ [/tex]
[tex] = (36 + 24 + 5) + (16 - 16 + 5)[/tex]
[tex] = (65) + (5)[/tex]
[tex] = 70[/tex]
nilai g(-6) + g(4) adalah 70