jika (3×-7)(3×+7)=a+2+b×+c,nilai a+b+c=
Matematika
saya403
Pertanyaan
jika (3×-7)(3×+7)=a+2+b×+c,nilai a+b+c=
1 Jawaban
-
1. Jawaban fatimah3085
(3x - 7)(3x + 7)
= (3x. 3x) - (7. 3x) + (3x . 7) - (7 . 7)
= 9x² - 21x + 21x - 49
= 9x² - 49
jadi = a = 9
b = 0
c = (-49)