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soal a
2x+5+4x-1
= 2x+4x+5-1
= 6x+4
soal b
6y-3+4x²-3y+4
= 6y-3y-3+4+4x²
= 3y+1+4x²
soal c
a+5+4a-7+5a-8
= a+4a+5a+5-7-8
= 10a-10
no 2
2b²-3a²+7 - (4a²-b²+4)
= 2b²-3a²+7-4a²+b²-4
= 2b²+b²-3a²-4a²+7-4
= 3b²-7a²+3
no 3
x = 3
y = 5
z = 6
soal a
2x + y + z²
= 2.3 + 5 + 6²
= 6+5+36
= 11+36
= 47
soal b
x² + 2xy - z²
= 3² + 2.3.5 - 6²
= 9 + 30 - 36
= 39-36
= 3