Question Simplify the expression n2+21 Evaluate n×n+21Solution n2+21 Show Solution Factor the expression 21(2n2+1) Evaluate n×n+21Multiply the terms n2+21Solution 21(2n2+1) Show Solution Find the roots n1=−22i,n2=22iAlternative Form n1≈−0.707107i,n2≈0.707107i Evaluate n×n+21To find the roots of the expression,set the expression equal to 0 n×n+21=0Multiply the terms n2+21=0Move the constant to the right-hand side and change its sign n2=0−21Removing 0 doesn't change the value,so remove it from the expression n2=−21Take the root of both sides of the equation and remember to use both positive and negative roots n=±−21Simplify the expression More Steps Evaluate −21Evaluate the power 21×−1Evaluate the power 21×iEvaluate the power More Steps Evaluate 21To take a root of a fraction,take the root of the numerator and denominator separately 21Simplify the radical expression 21Multiply by the Conjugate 2×22When a square root of an expression is multiplied by itself,the result is that expression 22 22i n=±22iSeparate the equation into 2 possible cases n=22in=−22iSolution n1=−22i,n2=22iAlternative Form n1≈−0.707107i,n2≈0.707107i Show Solution