3) Simplify and then evaluate:
a) (3x-2y)(x-y-1) -(x-1)(x+y) for x=1 and y=2
b) 6p(2p-3) -11; for p=2
Answers
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Answer:
a)6
b)1
Step-by-step explanation:
a)
=(3×1-2×2)(1-2-1)-(1-2)(1+2)
=(3-4)(-2)-(-1)(3)
=(-1)(-2)+3
=3+3
=6
b)
=6×2(2×2-3)-11
=12(1)-11
=12-11
=1
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