Question

Hasil dari (a-7b)(4a-2b)

Answer 1

= (a-7b)(4a-2b)
= (a*4a)+(a*(-2b))+(-7b*4a)+(-7b*(-2b))
= 4a² - 2ab - 28ab + 14b²
=  4a² + 14b² - 2ab - 28ab
= 4a² + 14b² - 30ab

Answer 2

(a-7b)(4a-2b)
4a2-5ab+14b2
nb:kuadrat4akuadrat,14b kuadrat