exam Maths Puzzle Numerical Ability

when we graph a quadratic equation wahat is the shape of it ?
the root of quadratic equation can also be called as ?

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exam Other Question

Rewrite the equation -7x + 8y = -40 as a function of x. What is the smallest positive integer that can be expressed as the sum of nine consecutive positive integers, the sum of ten consecutive positive integers, and the sum of eleven consecutive positive integers? Explain how you arrived at this number.