sederhanakan jawaban dibawah ini a. 18x-5(x-5) = B.12+2(4x-3= c.a(a+3b= d.2a(4a+5b tolong jawab

a.
(18x-5)(x-5)
= (18x . x) + (18x . (-5)) + ((-5) . x) + ((-5) . (-5))
= 18x² + (-90x) + (-5x) + 25
= 18x² - 95x + 25

b.
12+2(4x-3)
= 14 (4x-3)
= 56x - 42

c.
a(a+3b)
= (a . a) + ( a . 3b)
= a² + 3ab

d.
2a(4a+5b )
= (2a . 4a) + (2a . 5b)
= 8a² + 10ab

a. 18*-5*-5=...
    18*25=450

b. 12+2(4*-3)=...
    12-24=-12

c. a^2+3ab

d.8a^2+10ab