Question

Tolong dibantu
jika a= 2 dan b -5, tentukan nilai masing2 berikut!
a. 2a + 4b - a + 7b
b. 2ab - 3a + 4b - 3ab
c. -3a²b² + ab + 2a²b² - 5ab

Answer 1

A. 2(2) + 4(-5) - (2) + 7(-5)
= 4 - 20 - 2 - 35
= -53

b. 2(2)(-5) - 3(2) + 4(-5) - 3(2)(-5)
= -20 - 6 - 20 + 30
= -16

c. -3(2)² (-5)² + (2)(-5) + 2(2)²(-5)² - 5(2)(-5)
= -300 - 10 + 200 + 50
= -60

Answer 2

a. 2a + 4b - a + 7b = 2(2) + 4(-5) - 2 + 7(-5) = 4 - 20 - 2 - 35 = -53
b.2ab - 3a + 4b - 3ab = 2(2.-5) - 3(2) + 4(-5) - 3(2.-5) = -20 - 6 - 20 + 30 = -16
c.-3a²b² + ab + 2a²b² - 5ab = -3({2}².{-5)²) + (2.-5) + 2({2²}.{-5}) - 5(2.-5) = -300 - 10 + 200 + 50 = -60