9x2 + 4y2 + 16z2 + 12xy + 16yz + 24xz
when x = 1, y = -2 and z = 3.
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Answer: 121
Step-by-step explanation:
x = 1
y = - 2
z = 3
9(1)^2 + 4(-2)^2 + 16(3)^2+12(1 * -2)+16(-2*3)+24 (1*3)
= 9 + 16 + 144 - 24 - 96 + 72
= 25 + 144 - 24 - 96 + 72
= 169 - 24 - 96 + 72
= 145 - 96 + 72
= 145 - 24
= 121
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