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Ditanyakan : a. a+b+c | b. 2a²+3b-c | c. a² - 3b + c
Penyelesaian :
a. a+b+c
= 2x + 7y + (-9z)
= 2x + 7y - 9z
b. 2a²+3b-c
= 2(2x)² + 3(7y) - (-9z)
= 2(4x²) + 21y + 9z
= 8x² + 21y + 9z
c. a² - 3b + c
= (2x)² - 3(7y) + (-9z)
= 4x² - 21y - 9z
2. Dalam perkalian
a. 7(5x+4)
= 35x + 28
b. 9(-3x-5)
= -27x-45
c. -(14p+12q+19)
= -14p-12q-19
3. Rumus keliling segitiga adalah a+b+c
Jika diketahui : a = p cm | b = 5p cm | c = 6+p cm, maka:
Ksegitiga = p + 5p + (6+p)
= 6p + (6+p)
= 7p + 6 cm
4. Diketahui : (2-7t)(4t-1)
Ditanyakan : t = 1
Penyelesaian :
=(2-7(1)(4(1)-1)
=(2-7)(4-1)
=(-5)(-3)
=15
5. Sederhanakan!
a. 3(x-2) - 2(x-4)
= 3x - 6 - 2x + 8
= 3x - 2x - 6 + 8
= x + 2
b.
=