exam Maths Puzzle Numerical Ability

Explain how to Foil when factoring a polynomial of the form ax^2+bx+c when a=1
thank you

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exam Other Question

Solve for x:10^x to the power of 2 - x equals 100

Please show me steps to get the answer of x = -1 or 2 Graph the inequality and shade in the correct area of the graph:
2/3x + 3y <= 12