book Maths Puzzle Numerical Ability

Perform the indicated operation; express answer in factored form:
(x + 5)2 • x2 + 6x + 8
2x2 – x – 6 x + 5

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book Other Question
Waht is the meaning of congruent, and complementary. how do I solve this with step by step solution?
square root of (5x^2-9)=2x