exam Maths Puzzle Numerical Ability

Find the value of c so that the quadratic equation 2x^2+4x-c=0 has two equal real roots.

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exam Other Question

this is a equationg exponests equation please help{{{(0.25)^(x+8)=(0.5)^((x^2)+1)}}} I was given an equation of a line and a point and told to determine whether the point is on the line using substitution. Heres two problems

y=x-4;A(5,1)

y=4x+2;A(1,6)