book Maths Puzzle Numerical Ability

help me. I am the mother and cannot figure this out. What is 12 - x = 8?
My husband and I come up with -4 but that would equal 16.

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book Other Question

(Find all real roots of the following equations:
4) (2x - 3)2 = (3x + 1)2;
(5) 3t 4 - 8t 2 + 5 = 0;
(6) 3x3 - 5x2 - 3x + 5 = 0.
marks) Factorize the following expressions:
(1) How many tiles, which measures 1x1 would I need to fill a 10x14 room?