A. Sederhanakan 3(2x-5)-5(x-7)= B. Kurangkan 5a + 3ab-1 dari 5-2ab+3a C. Sederhanakan (5x-7)(6x+5)= D. Hasil dari (3×+5y)(3×-5y)adalah E. (5×-2y)2

a) 3(2x - 5) - 5(x - 7)
= 6x - 15 - 5x + 35
= 6x - 5x - 15 + 35
= x + 20

b) ( 5 - 2ab + 3a) - (5a + 3ab - 1)
= - 2ab - 3ab + 3a - 5a + 5 + 1
= - 5ab - 2a + 6

c) (5x - 7)(6x + 5)
= (5x•6x) + (-7•6x) + (5x•5) + (-7•5)
= 30x² - 42x + 25x - 35
= 30x² - 17x - 35

d) (3x + 5y) (3x - 5y)
= (3x•3x) + (5y•3x) + (3x•-5y) + (5y•-5y)
= 9x² + 15xy - 15xy - 25y²
= 9x² - 25y²

e) (5x - 2y)²
= (5x)² - 2•5x•(-2y) + (2y)²
= 25x² + 20xy + 4y²