Tentukan penjaran bentuk aljabar berikut: a(2x+3)(x-4) b.(a+36)(a-5b) c.(5m-1)(2m+4)

a. 2x²-8x+3x-12
=2x²-5x-12

b.a²-5ab+36a-180b

c. 10m²+20m-2m-4
=10m²+18m-4

a. =2x^2-8x+3x-12
=2x^2-5x-12

b. = a^2-5ab+36a-180b
= a^2-a(5b-36)-180b

c. = 10m^2+20m-2m-4
10m^2+18m-4