exam Maths Puzzle Numerical Ability

please help me with this problem i forgot how to do this over the summer.
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exam Other Question


Hello again. Last question it is again about the tsunami word problem but its another question. SQUARE ROOT 9.8*4000. I am really confused.
1. 5(x - 2)^2=3

2. Find the x-intercepts. y = x^2 + 3x - 8

3. Find the axis of symmetry. "y = x^2 - 5 + 10"
4. Solve. (x - 3)^2 = 6