factorise 7x^2+35x+42.
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28
7x^2 + 35x + 42
= 7 ( x^2 + 5x + 6 )
= 7 ( x^2 + 3x + 2x + 6 )
= 7 [ x ( x + 3 ) + 2 ( x + 3 ) ]
= 7 ( x + 2 ) ( x + 3 )
= 7 ( x^2 + 5x + 6 )
= 7 ( x^2 + 3x + 2x + 6 )
= 7 [ x ( x + 3 ) + 2 ( x + 3 ) ]
= 7 ( x + 2 ) ( x + 3 )
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5
Answer:
7(x+2)(x+3)
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