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a) x= 4, y= 1, z= 3
2x^2+ 5y - z
2(4)^2+ 5(1) - (3)= 8^2 + 5 -3= 64 + 5 -3 = 66
b) x= 1, y= -2, z= 2
2x^2+ 5y - z
2(1)^2+ 5(-2)- (2)= 2^2 - 10 -2 = 4 - 12= - 8
c) c. x= 3, y= -1, z=4
2x^2+ 5y - z
2(3)^2+ 5(-1)- (4)= 6^2 - 5 -4= 36-9= 27
d) ×= 5, y= 3, z= 8
2x^2+ 5y - z
2(5)^2+ 5(3)- (8)= 10^2 +15-8= 100+7= 107
nomor 1
a. 3(4x + 5)
12x + 15
b. 5(2x + y - z)
10x + 5y - 5z
c. 7(p-2q + 3r)
7p - 14q + 21r
d. 4x(× + 3y + z)
4x^2 + 12xy + 4xz
nmor 2
a. (× - 2)(x + 3)
x^2 + 3x - 2x - 6 = x^2 + x - 6
b. (x - 3)(× + 7)
x^2 + 7x - 3x -21 = x^2 + 4x -21
c. (x - 5)(x + 5)
x^2 + 5x - 5x - 25 = x^2 - 25
d. (3^ − √(3) (3^ + √(3)
9x^2 - 3
note ^ adalah lambang pangkat