To substitute a number or new expression for a variable, enclose an expression in square brackets, enter an assignment for the variable in a subscript, and choose Evaluate.
Evaluate
x2 + 2x - 3
= a2 +2a - 3 6pt
x2 + 2x - 3
= 32 6pt
=
y - z
-
y +
z
The expression in the subscript is an assignment for the variable on the left of the equals sign. Notice that, in particular, x = y + z, y = x - z and z = x - y are not equivalent assignments.
Evaluate
x + y
6pt = 2y + z
x + y
6pt = 2x - z
x + y
= x + y
To substitute two numbers or new expressions for a variable and find the difference, enclose an expression in square brackets
Evaluate
x
= b - a 4pt
x2 + 2x - 3
= b2 +2b - a2 -2a pt
x2 + 2x - 3
= 20
Evaluate, Factor
=
y + z
-
z -
y - z
=
z
2y - 3
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From the expanding brackets panel, you can choose a nonprinting dashed vertical line for the left bracket; and a square bracket or vertical line for the right bracket. You can also enter from the keyboard a right vertical line only, with subscript, or with both subscript and superscript.
Evaluate
x2 - 3
= b2 - a2 6pt
x2 - 3
= b2 - a2 6pt
x2 - 3
= b2 - a2 6pt
x + 3|x=y+z = y + z + 3 6pt
x + 3|x=y+zx=u-v = u - v - y - z