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b. 2a + 3 ( b+c )² = 2(2x) + 3 (5-3z)² = 4x + 3(25-15z-15z+9) = 4x + 3(25-30z+9) = 4x + 75 - 90z + 27 = 4x + 102 - 90z
=2() + 3(5) -()
= +15 -
b)2a+ 3 tex] (b+c)^{2} [/tex]
= 2(2x) + 3(
=4x + 3(25-30z+)
=4x + 75 - 90z+ 27