Factorise 1 + 14x + 49x square
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1 + 14x + 49x square
49x square + 14x + 1 = 0
49x square + 7x + 7x + 1 = 0
7x ( 7x + 1 ) + 1 ( 7x + 1 ) = 0
( 7x + 1 ) ( 7x + 1 ) = 0
7x + 1 = 0 , 7x + 1 = 0
x = -1/7 , x = -1/7
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