Question

Pakai cara,
tolong dijawab

Answer 1

1a) (6x + 5) + (-3x - 6)
= 6x - 3x + 5 - 6
= 3x - 1
b) (6x - 5y - 2z) + (-8x + 6y + 9z)
= 6x - 8x - 5y + 6y - 2z + 9z
= -2x + y + 7z
c) 3(2x² - 4x + 5) + 2(4x² + 3x - 7)
= 6x² + 8x² - 12x + 6x + 15 - 14
= 14x² - 6x + 1

2)( 7x + 5y) - (5x - 9y)
= 7x - 5x + 5y + 9y
= 2x + 14y
b) (5y - 3x - 4) - (5x - 3y + 7)
= 5y + 3y - 3x - 5x - 4 - 7
= 8y - 8x - 11
c)( 5x² - 9xy - 4y²) - (-x² + 6xy + 3y²)
= 5x² + x² - 9xy - 6xy - 4y² - 3y²
= 6x² - 15xy - 7y²

3a) 5x²(6x - 3y)
= 30x³ - 15x²y
b) (2x - 2)(x + 5)
= (2x . x) + (-2 . x) + (2x . 5) + (-2 . 5)
= 2x² - 2x + 10x - 10
= 2x² + 8x - 10
c) (x - 5)(x² - 4x + 20)
= x³ - 4x² + 20x - 5x² + 20x - 100
= x³ - 9x² + 40x - 100