exam Maths Puzzle Numerical Ability

complete the square, and find the roots of the quadratic equation
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x2 + 16x = 0

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exam Other Question

simplify: 3 square roots of(2/7) - 5 square roots of(7/2) + 3 square roots of 56. The Robinson family went to dinner. the bill came out to be $230 including a 17% tip. what was the total amount of $ due excluding the tip price?