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(x+4)(x+15)
x²+15x+4x+60
x²+19x+60
sorry klo slh, yg lain gk tau
= - 10a²x² - 40a²bx² - 25ab²x²
------------------------------------------- ( -5 )
2a²x² + 8a²bx² + 5ab²x²
2. ( x+ 4) ( x + 5)
= x² +5x + 4x + 20
= x²+ 9x + 20
3. ( y + 4) ( y² + 4y + 16)
= y³ + 4y² + 16y + 4y² + 16y + 64
= y³ + 8y² + 32y + 64
semoga membantu