Find the cost of x3+8x2-5x+1 pencils if one pencil is 3x-4 rs
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total cost of given number of pencils
=(x3+8x2-5x+1)×(3x-4)
=3x⁴+24x³-15x²+3x-4x³-32x²+20x-4
=3x⁴+20x³-47x²+23x-4
=(x3+8x2-5x+1)×(3x-4)
=3x⁴+24x³-15x²+3x-4x³-32x²+20x-4
=3x⁴+20x³-47x²+23x-4
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