Replace d with r+6:
(r+6)*r = 2*(r+6-6)*(r-6)
Give this problem to my universal simplifier:
| Solved by pluggable solver: EXPLAIN simplification of an expression | |
Your Result: YOUR ANSWERDETAILED EXPLANATIONLook at Added fractions or integers together It becomes Look at Remove extraneous zero It becomes Look at Remove unneeded parentheses around factor It becomes Look at Moved these terms to the left It becomes Look at Expanded term It becomes Look at Reduce similar several occurrences of It becomes Look at Expanded term It becomes Look at Multiplied numerator integers It becomes Look at Reduce similar several occurrences of It becomes Look at Eliminated similar terms It becomes Look at Eliminated similar terms It becomes Look at Added fractions or integers together It becomes Look at Added fractions or integers together It becomes Look at Removed extra sign in front of It becomes Look at Remove unneeded parentheses around factor It becomes Look at Remove unneeded parentheses around factor It becomes Look at Remove extraneous '1' from product It becomes Look at Equation It becomes Result: This is an equation! Solutions: r=0,r=18. Universal Simplifier and SolverDone! |
We can dismiss r=0 answer because it is nonsensical, so we have, r=18. Since d=r+6, dorothy's age = 18+6 = 24.