This is similar to Problem 2 from your Section 4.4 worksheet.

Factor.

$21 q^2-5 q-4= \big($ $\big) \big($ $\big)$

$18 x^2 + 63 x-11 = \big($ $\big) \big($ $\big)$

$m^4+14 m^2 +33 = \big($ $\big) \big($ $\big)$

Hint: