exam Maths Puzzle Numerical Ability

Find

(c - 5)(c - 7)

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

Help.

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exam Other Question

solve by graphing
x-2y = 8
3x - 2y = 12
Can you please help me with this i do not understand this?

Solve by factoring

x^2 - 9x = -20

thank you
julie