exam Maths Puzzle Numerical Ability

Solve the following quadratic equations by using quadratic formula.

2.1y^2-3.5y=4

a(a+2)=-1

6x^2+5x-4=3x-2

4x^2-14x-27=3

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exam Other Question

Determine whether each statement given below is true or false.
Let f(x) = x^3-34x^2+349x-1020.

There is a root of the equation F(X)=0 in the open interval (4, 6)

There is m<1+m<2=180 degrees given
m<2=m<3 given

m<1+m<3=180 degrees property?????????????