book Maths Puzzle Numerical Ability

Let f(x)=13x^2+65x+3. Find a such that f(a)=3

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book Other Question

The inverse of the coefficient matrix is given. Use the inverse to solve the linear system.

{3x + 2y +10z =1}
-2x - y -7z =-2
3x + 2y +11z =3
[3 -2 -4
1 3 1
-1 0 1 how do you write the equation of a line in standard form with a slope of 3 and ay intercept of 2