21x2 - 31x + 8 = (3x - 8)(7x - 1)
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y = 3x + 21x2 = 3x(1 + 7x)
To factor 4x^2 - 21x + 5, we look for two binomials in the form (Ax + B)(Cx + D) that multiply to give 4x^2 - 21x + 5. We can determine the values of A, B, C, and D by examining the factors of 4 and 5. The factored form is then (4x - 1)(x - 5).
21x + 9 = 180 21x = 180 - 9 21x = 171 x = 171/21 x = 8.143
20x + 5 - 20 = 21x + 4 -x = 4 + 15 x = -19
It is 21x.