exam Maths Puzzle Numerical Ability

EFGH is a parallelogram. Find EF and FG

It is a sideways square and E to H side is 7, H and G is 8, ??

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exam Other Question

a number u times 5 5.3.1.1.
How do I solve this using factoring?

(x - 2)(2x - 5) = 0

thank you.