exam Maths Puzzle Numerical Ability

Find the constant term that should be added to make the following a perfect square trinomial:
x^2 + 7x
Multiple choice:
a)49
b)49/2
c)7/2
d)49/4

Thank you for your help

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exam Other Question

Factor the following expression:

a^2(b - c) - 16b^2(b - c)

I need help yet again, please!!
(rs) radical sign

simplify

2(rs)12+4(rs)24