exam Maths Puzzle Numerical Ability

Multiply and Simplify: x^2-7x+12*x^2+6x+8
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X^2-6x+8 x62-x-6

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Can you help me factor 25a^2-16 please thanks How many pounds of a 12% aluminum alloy must be mixed with 400 pounds of a 25% aluminum alloy to make a 17% aluminum alloy?