exam Maths Puzzle Numerical Ability

For the quadratic equation x^2 + kx +7 =0, if 3+sqrt2 is a root, what is the value of k ?
I said 6 but my teacher marked it wrong. Please help me :)

Read Solution (Total 0)

exam Other Question
The length of a rectangle is four times the width. The perimeter is 150 inches. Find the dimensions of the rectangle. factor by grouping

4x^3 - x^2 - 12x + 3