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Question

Factorise: $$15{ x }^{ 2 }-x-28$$


Solution

The given expression $$15x^2-x-28$$ can be factorised as follows:

$$15x^2-x-28=15x^2-21x+20x-28=3x(5x-7)+4(5x-7)=(3x+4)(5x-7)$$

Hence, $$15x^2-x-28=(3x+4)(5x-7)$$

Mathematics

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