Question

factorise following expression?x²-4x-21​

Answer 1

hope this help you alot

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Answer 2

Step-by-step explanation: [x-7]  [x+3]

Explanation:

one way is to 'split' the middle term

that is -4x= -7x+3x-21

factorise each 'pair' of terms

x[x-7]+3[x-7]

take out the common factor [x-7]

=[x-7]  [x+3]