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l2x+8l = 12
2x+8 = 12
2× = 12-8 = 10
×=10/2 = 5
hp = (×/×=5 )
b.
l3x+9l =18
3× =18-9 =9
×=9/3 =3
hp = (×/×=3)
kira2 seperti itu jwbnnya
4x^2 +32x + 64 = 144
4x^2 + 32x - 80 = 0 (bagi 4 semua)
x^2 + 8x - 20 = 0
(x + 10)(x - 2) = 0
Jadi x = -10 atau x = 2
b. (3x+9)^2 = 18^2
9x^2 + 54x +81 = 324
9x^2 + 54x - 243 = 0 (bagi 3 semua)
3x^2 + 18x - 81 = 0
(3x-9)(x+9) = 0
Jadi x = 3 atau x = -9