Question

Evaluate the expression a -3bc if a = -5 b= -4 c = 10

Answer 1

The algebraic expression given is;

`\begin{gathered} a^2-3bc \\ \text{where;} \\ a=-5 \\ b=-4 \\ c=10 \end{gathered}`

Substituting these values into the expression;

`\begin{gathered} a^2-3bc=(-5)^2-3(-4)(10) \\ =25-3(-40) \\ =25+120 \\ =145 \end{gathered}`

Therefore, the value is 145.