Simplify each of the following algebraic expressions by removing grouping symbols.
a) -2(x2 – y2 + xy) – 3(x2 +y2 – xy)
b) 7. a – [b – {a – (b – 1) + 3a}]
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a) -2(x2-y2 +xy) -3(x2+y2-xy)
= -4x +4y -2xy -6x -6y +3xy
=-10x -2y -xy
b)a -[b -{ a -(b -1) +3a}]
= a-[b-{a- b +1)+ 3a}]
=a -[b -a +b - 1 +3a ]
= a -b + a - b+ 1 -3a
= -a - 2b + 1
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