Question Factor the expression (x−9)(x+9) Evaluate x2−81Rewrite the expression in exponential form x2−92Solution (x−9)(x+9) Show Solution Find the roots x1=−9,x2=9 Evaluate x2−81To find the roots of the expression,set the expression equal to 0 x2−81=0Move the constant to the right-hand side and change its sign x2=0+81Removing 0 doesn't change the value,so remove it from the expression x2=81Take the root of both sides of the equation and remember to use both positive and negative roots x=±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 x=±9Separate the equation into 2 possible cases x=9x=−9Solution x1=−9,x2=9 Show Solution
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