book Maths Puzzle Numerical Ability

plese show me how to execute each of the indicated multiplications, thankx
(x-2)(x^2+2x+4)
(5x^2+7x+3)(8x+2)
4x-6)(2x+1)

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book Other Question

Fenton Rent-A-Truck charges $32.85 plus $.49 per mile for a certain truck. Handy Truck Rents charges $31.95 plus $.48 for the same truck. For what mileage is the cost the same? What is the point- slope form of an equation with the slope 3/5 that passes through the point (10,-2)? Please help me?