exam Maths Puzzle Numerical Ability

Graph the function

f(x) = -3x

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exam Other Question

Apply the quadratic formula to find the roots of the given function, and then graph the function.

g(x) = x2 + x + 12
My question is if the length of one of the equal legs of an isosceles triangle is 8 cm less than 4 times the length of the base and the perimeter is 29 cm, then what is the length of one of the equal legs?