book Maths Puzzle Numerical Ability

Can you help me with this problem?

x squared +x -12 multiply by x squared +5x +6 divided by x +3
x squared +x -30 x squared -2x -3 x squared +7x +6

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book Other Question

During a lesson on factoring natural number, Marcia said, "I think when you factor an odd number, you always get odd factor."
a, Is Marcia correct?
b, How could you convince Marcia and the rest of the class that Marcia is or is not correct. I dont quite understand ow to solve this problem.

Solve for a H=18t+1/2at(this last t is supposed to be squared)