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Pilihan Topik Matematika - at ee-cafe.org

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Jika kurva y 2 = 15x ditambahkan pada y 1 = 2x 2 maka kurva y 1 akan<br />

bertambah tinggi di sebelah kanan titik [0,0] dan menjadi rendah di<br />

sebelah kiri titik [0,0] seperti terlih<strong>at</strong> pada Gb.4.7.a.<br />

y 1 =2x 2<br />

150<br />

y<br />

y 4 =2x 2 +15x<br />

-10 0<br />

0<br />

x<br />

(a)<br />

x = −15/2<br />

y 2 =15x<br />

-150<br />

150<br />

sumbu simetri y<br />

−15/4<br />

y 4 =2x 2 +15x<br />

−15/2<br />

-10 0<br />

0<br />

x<br />

(b)<br />

sumbu simetri<br />

150<br />

y<br />

-150<br />

y 5 = 2x 2 +15x+13<br />

y 4 = 2x 2 +15x<br />

-10 0<br />

0<br />

x<br />

(c)<br />

-150<br />

Gb.4.7. Penjumlahan y 1 = 2x 2 , y 2 = 15x, dan y 3 = 13<br />

44<br />

Sudary<strong>at</strong>no Sudirham, “<strong>Pilihan</strong> <strong>Topik</strong> <strong>M<strong>at</strong>em<strong>at</strong>ika</strong>”

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