exam Maths Puzzle Numerical Ability

Can you please help me with this i do not understand this?

Solve by factoring

x^2 - 9x = -20

thank you
julie

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exam Other Question

Find

(c - 5)(c - 7)

(3y - 4)(2y^2 + y - 1)

Help. I need help trying to solve this problem.
____3___ -__2__
12+x-x^2 x^2-9

Sure hope I did this right. This problem cam from the 10th Edition of Introductory to Algebra by Mar