Check an algebraic answer numerically

01

Press these keys

STO→ALPHAENTER

02

Walkthrough

1
Store the candidate
Store your proposed value in a letter such as X.
2
Evaluate both sides
Enter each side of the original equation separately.
3
Compare
Matching values support the answer; they do not replace a proof or derivation.

03

Worked example

Check x=(−3+√17)/2 for x²+3x−2=0.

NORMAL FLOAT AUTO REAL MPX²+3X−2≈0

AnswerThe residual is approximately 0, so the value satisfies the equation numerically.