a. (y-3)(y+2) b. (p-4)(p+5) c. (7-b)(-4+b) adalah....

a) (y-3)(y+2)= y2+2y-3y-6=y2-y-6
b) (p-4)(p+5)= p2+5p-4p-20=p2+p-20
c) (7-b)(-4+b)= -28+7b+4b-b2=-28+11b-b2

Mata Pelajaran: Matematika
Kelas: SMP VIII
Materi: Operasi Aljabar

a)
(y - 3)(y + 2)
= (y)(y) + (y)(2) + (-3)(y) + (-3)(2)
= y² + 2y - 3y - 6
= y² - y - 6

b)
(p - 4)(p + 5)
= (p)(p) + (p)(5) + (-4)(p) + (-4)(5)
= p² + 5p - 4p - 20
= p² + p - 20

c)
(7 - b)(-4 + b)
= (7)(-4) + (7)(b) + (-b)(-4) + (-b)(b)
= -28 + 7b + 4b - b²
= -28 + 11b - b²
= -b² + 11b - 28
= -(b² - 11b + 28)