Faktorkan! 1.4a(4a-9b)+9b(4a-9b) 2.x(4x-y)-6y(4x-y)

1. (4a+9b)×(4a-9b)
2. (x-6y)×(4x-y)

Matematika
Aljabar dasar VIII SMP

Pembahasan :
4a(4a - 9b) + 9b(4a - 9b)
= (4a)(4a) - (4a)(9b) + (9b)(4a) - (9b)(9b)
= 16a² - 36ab + 36ab - 81b²
= 16a² - 81b²
= (4a)² - (9b)²
= (4a + 9b)(4a - 9b)

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x(4x - y) - 6y(4x - y)
= (x - 6)(4x - y)