exam Maths Puzzle Numerical Ability

y=-3.5x+50
Solve equation using x as the variable as well as using a graph

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exam Other Question

2. The following equation has degree 4 because the highest power of the variable x is 4:
x^4 � 3 x^2 + 2 = 0.
Explain how one can use the quadratic formula to solve this equation by using a change of variable. Solve this equation completely. Find the indicated outputs for f(x)=3x^2-3x
f(0)=
f(-1)=
f(2)=