Question 40: Simplify the expression \(A=(4 x-1) \cdot(3 x+1)-5 x \cdot(x-3)-(x-4) \cdot(x-3) \)
We have
\(\begin{aligned} &A=12 x^{2}+4 x-3 x-1-5 x^{2}+15 xx^{2}+3 x+4 x-12 \\ &A=6 x^{2}+23 x-13 \end{aligned}\)
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Question 40: Simplify the expression \(A=(4 x-1) \cdot(3 x+1)-5 x \cdot(x-3)-(x-4) \cdot(x-3) \)
We have
\(\begin{aligned} &A=12 x^{2}+4 x-3 x-1-5 x^{2}+15 xx^{2}+3 x+4 x-12 \\ &A=6 x^{2}+23 x-13 \end{aligned}\)
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