Simplify −7g(2g + 3).

a) −14g2 − 21g

b) −14g2 + 3

c) −14g − 21g

d) −14g + 3

The simplified form of −7g(2g + 3) is -14g^2 - 21g, so the answer is a) −14g^2 − 21g.