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kurung itu artinya kali so -2(2y-x) bisa ditulis (-2 . 2y) + (-2 . -x)
(-2 . 2y) + (-2 . -x) = -4y + 2x
2.6x^2 +6x -12 = ax^2 + bx + c
6x^2 = ax^2
a = 6
6x = bx
b = 6
-12 = c
ditanya
a + b + c = 6 + 6 + (-12) = 12 - 12 = nol a.k.a 0
3.(3p + 5)^2 = (3p+5)(3p+5) = (3p.3p)+(3p.5)+(3p.5)+(5.5)=9p^2+30p+25
keterangan : ^ artinya pangkat dan kali bisa ditulis titik .