exam Maths Puzzle Numerical Ability

Given: 5x+4<14
Prove: x<2

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Can someone please explain this and dumbify it down - thank you so much in advance:

Multiply:
(5&#8730;[2] + 3)(&#8730;[2] - 2&#8730;[3]) hi,
i need some help with this problem please. solve the quadratic equation x^2+5x-6=0. thank you so much!!