Question Simplify the expression x2−4 Evaluate (x−2)(x+2)Use (a−b)(a+b)=a2−b2 to simplify the product x2−22Solution x2−4 Show Solution Find the roots x1=−2,x2=2 Evaluate (x−2)(x+2)To find the roots of the expression,set the expression equal to 0 (x−2)(x+2)=0Separate the equation into 2 possible cases x−2=0x+2=0Solve the equation More Steps Evaluate x−2=0Move the constant to the right-hand side and change its sign x=0+2Removing 0 doesn't change the value,so remove it from the expression x=2 x=2x+2=0Solve the equation More Steps Evaluate x+2=0Move the constant to the right-hand side and change its sign x=0−2Removing 0 doesn't change the value,so remove it from the expression x=−2 x=2x=−2Solution x1=−2,x2=2 Show Solution
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