exam Maths Puzzle Numerical Ability

Find all positive values for k for which each of the following can be factored.

x^2+x-k

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exam Other Question

Use the given conditions to write an equation for the line in slope-intercept form.
Passing through (5, -3) and parallel to the line whose equation is y = -7x + 7. Factor the polynomial, if possible

X^4-81

i put on my answer sheet online (x^2-9)(x^2+9) and t says incorreect the i factor that to (x^2+9)(x-3)(x+3) and it still says incorrect ????????