问题 Simplify the expression z2−665 Evaluate z2−655−10解题方案 z2−665 显示解题方案 Find the roots z1=−665,z2=665Alternative Form z1≈−25.787594,z2≈25.787594 Evaluate z2−655−10To find the roots of the expression,set the expression equal to 0 z2−655−10=0Subtract the numbers z2−665=0Move the constant to the right-hand side and change its sign z2=0+665Removing 0 doesn't change the value,so remove it from the expression z2=665Take the root of both sides of the equation and remember to use both positive and negative roots z=±665Separate the equation into 2 possible cases z=665z=−665解题方案 z1=−665,z2=665Alternative Form z1≈−25.787594,z2≈25.787594 显示解题方案
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