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=2 x (-1) + 3 x 1 + 4 x (-1) x 1 - (-2)
= (-2) + 3 - 4 - (-2)
= -1
b.) pq² - p²+q - r
=(-1) x 1² - (-1)² + 1 - (-2)
=(-1) -1 + 3
=1
c.) p² + q² +r2
=(-1)² + 1² + (-2) x 2
=1 +1 - 4
=-2
d.) p² - q² - r²
=(-1)² - 1² -(-2)²
=1-1-4
=-4
e.) pq + pr + qr
=(-1) x 1 + 1 x (-2) + 1 x (-2)
=(-1) + (-2) + (-2)
=(-5)