Question

factorise which of the following algebraic expressions........ x² +12x -45.........​

Answer 1

Answer:

${x}^{2} + 12x - 45 \\ \\ = {x}^{2} + (15 - 3)x - 45 \\ \\ = {x}^{2} + 15x - 3x - 45 \\ \\ = x(x + 15) - 3(x + 15) \\ \\ = (x + 15)(x - 3)$

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