150x^2 - 420xy + 294y^2
6 is a common factor of all three elements therefore factor this out
=6(25x^2 -70xy + 49y^2)
Now factor the expression in the brackets
=6(5x - 7y)(5x-7y)
which is the same as 6(5x-7y)^2
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Verified answer
150x^2 - 420xy + 294y^2
6 is a common factor of all three elements therefore factor this out
=6(25x^2 -70xy + 49y^2)
Now factor the expression in the brackets
=6(5x - 7y)(5x-7y)
which is the same as 6(5x-7y)^2