Question Simplify the expression 3x2+21 Evaluate 3(x2+7)Apply the distributive property 3x2+3×7Solution 3x2+21 Show Solution Find the roots x1=−7×i,x2=7×iAlternative Form x1≈−2.645751i,x2≈2.645751i Evaluate 3(x2+7)To find the roots of the expression,set the expression equal to 0 3(x2+7)=0Rewrite the expression x2+7=0Move the constant to the right side x2=−7Take the root of both sides of the equation and remember to use both positive and negative roots x=±−7Simplify the expression More Steps Evaluate −7Evaluate the power 7×−1Evaluate the power 7×i x=±(7×i)Separate the equation into 2 possible cases x=7×ix=−7×iSolution x1=−7×i,x2=7×iAlternative Form x1≈−2.645751i,x2≈2.645751i Show Solution