Question Simplify the expression x2−1 Evaluate (x−1)(x+1)Use (a−b)(a+b)=a2−b2 to simplify the product x2−12Solution x2−1 Show Solution Find the roots x1=−1,x2=1 Evaluate (x−1)(x+1)To find the roots of the expression,set the expression equal to 0 (x−1)(x+1)=0Separate the equation into 2 possible cases x−1=0x+1=0Solve the equation More Steps Evaluate x−1=0Move the constant to the right-hand side and change its sign x=0+1Removing 0 doesn't change the value,so remove it from the expression x=1 x=1x+1=0Solve the equation More Steps Evaluate x+1=0Move the constant to the right-hand side and change its sign x=0−1Removing 0 doesn't change the value,so remove it from the expression x=−1 x=1x=−1Solution x1=−1,x2=1 Show Solution
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