21x2 + 27x - 30 = 3*(7x2 + 9x - 10) = 3*(7x2 - 5x + 14x - 10)
=3*[x*(7x - 5) + 2*(7x - 5)]
= 3*(7x - 5)*(x + 2)
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If you mean: 21x2-59x+8 then it is (3x-8)(7x-1) when factored Making use of the quadratic equation formula will help
(7x + 2)(3x - 5)
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21x2 - 31x + 8 = (3x - 8)(7x - 1)
y = 3x + 21x2 = 3x(1 + 7x)