Question

What are the solution(s) of the quadratic equation 98 – x2 = 0?

x = Plus or minus 2 StartRoot 7 EndRoot
x = Plus or minus 6 StartRoot 3 EndRoot
x = Plus or minus 7 StartRoot 2 EndRoot
no real solution

Answer 1

Solve 98 − x^2 = 0:
x^2 = 98 → x = ±√98 = ±√(49·2) = ±7√2.

So the correct choice is x = ±7√2.