</span><span>the equation is contradictory, just to prove
7r</span>² + 9 = 1
7r² + 9 -1 = 0
7r² + 8 = 0
<span>We write the equation in the form of products of </span> 7 * (r² + 8/7) = 0
<span>the product is equal to 0 when one of the factors is zero </span> 7≠0 ∨ (r² + 8/7) = 0 r² ≠ - 8/7 <span>any number squared is not negative.
</span><span>We proved that none of the factors is not equal to zero , so the right side of the equation is not equal to the left . The equation is contradictory</span>
