Question

1.hasil dari (4x-5y)²-4x(2x-3y)

2.jika 3(½x+1½)=¾(¼x-¼) adalah...
3.hasil dari (-3a - 4b)(2a-5b) adalah....

Answer 1

17273728282929938373727828282

Answer 2

1. 16x² - 40xy + 25y² - 8x² + 12xy = 8x² - 28xy + 25y²
2. 3 1/2 x + 9/2 = 3/16 x - 3/16
    7/2 x + 9/2 = 3/16 x - 3/16
    7/2 x - 3/16 x = -3/16 - 9/2
    56-3/16 x = -3-56/16
    53/16 x = -59/16 ⇒ dikalikan 16
    53 x = -59
        x = -59/53
3. -6a² + 15ab - 8ab + 20b² = -6a² + 7ab + 20b²