Question Factor the expression (k−9)(k+9) Evaluate k2−81Rewrite the expression in exponential form k2−92Solution (k−9)(k+9) Show Solution Find the roots k1=−9,k2=9 Evaluate k2−81To find the roots of the expression,set the expression equal to 0 k2−81=0Move the constant to the right-hand side and change its sign k2=0+81Removing 0 doesn't change the value,so remove it from the expression k2=81Take the root of both sides of the equation and remember to use both positive and negative roots k=±81Simplify the expression More Steps Evaluate 81Write the number in exponential form with the base of 9 92Reduce the index of the radical and exponent with 2 9 k=±9Separate the equation into 2 possible cases k=9k=−9Solution k1=−9,k2=9 Show Solution
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