8. If.x = -3, y = 4 and 2 = -2, find the value of x² + y2 + 22 - xy - yz - zx.
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Answer:
61
Step-by-step explanation:
x=(-3), y=4, z=(-2)
x²+ y²+22-xy-yz-zx
=(-3)²+(4)²+22-(-3)(4)-(4)(-2)-(-2)(-3)
=9+16+22+12+8-6
=61
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