Expand and simplify the following expression: x(5x – 2) – 3(x2 – 2x + 7)

5x2 – 2x – 3x2 + 6x – 21= 2x2 + 4x − 21

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How do you factorise a quadratic equation?


Factorise x^2 + 2x – 15


solve x/2 + 11 = 15


Make s the subject of the equation: 4st + 8 = 5r


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