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y=-3
z=4
= 4(2) + 3(-3) + 2(4)
= 8 + -9 + 8
= -1 + 8
= 7
b) 2(2) - 5(-3) + 3(4)
= 4 - -15 + 12
= -11 + 12
= 1
c) 2^2 - 2(-3)^2 - 6(4)^2
= 4 - -36 - 676
= -32 - 676
= -708
*semoga membantu
*cuman bisa ngerjain yang nomor 4
*insyaalah bener jawabannya