exam Maths Puzzle Numerical Ability

Please help me "evaluate the expression" for a= -2, b= 4, c=3

2b^ - 4ac + bc

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exam Other Question

Factor by grouping. 48x^3 + 42x^2 � 8x � 7 im kinda at a loss right now with this one, please help. w divded by 9 =14