Pertanyaan

Persamaan fungsi kuadrat yang grafiknya memotong sumbu X di titik (1,0) dan (-2, 0) dan melalui titik (0,-6) adalah ...

I. Sutiawan

Master Teacher

Mahasiswa/Alumni Universitas Pasundan

Jawaban terverifikasi

Pembahasan

$D a r i space t i t i k space p o t o n g space s u m b u space x space k i t a space d a p a t space x subscript 1 equals 2 space d a n space x subscript 2 equals 1 y equals a left parenthesis x minus x subscript 1 right parenthesis left parenthesis x minus x subscript 2 right parenthesis y equals a left parenthesis x minus x left parenthesis negative 2 right parenthesis right parenthesis left parenthesis x minus 1 right parenthesis y equals a left parenthesis x plus 2 right parenthesis left parenthesis x minus 1 right parenthesis S e l a n j u t n y a space k i t a space t e n t u k a n space n i l a i space a space d e n g a n space m e n d i s t r i b u s i space n i l a i space x space d a n space y space d a r i space t i t i k left parenthesis 0 comma negative 6 right parenthesis k e space p e r s a m a a n space d i space a t a s minus 6 equals a left parenthesis 0 plus 2 right parenthesis left parenthesis 0 minus 1 right parenthesis minus 6 equals a left parenthesis 2 right parenthesis left parenthesis negative 1 right parenthesis minus 6 equals equals 2 a a equals fraction numerator negative 6 over denominator negative 2 end fraction a equals 3 j a d i space f u n g s i space k u a d r a t space a d a l a h y equals 3 left parenthesis x plus 2 right parenthesis space left parenthesis x minus 1 right parenthesis y equals 3 left parenthesis x squared plus x minus 2 right parenthesis y equals 3 x squared plus 3 x minus 6$