Pre-Algebra Examples

$y = x^{2} - 4$

Step 1

To find the y-intercept(s), substitute in $0$ for $x$ and solve for $y$ .

$y = {(0)}^{2} - 4$

Step 2

Solve the equation.

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Step 2.1

Remove parentheses.

$y = 0^{2} - 4$

Step 2.2

Remove parentheses.

$y = {(0)}^{2} - 4$

Step 2.3

Simplify ${(0)}^{2} - 4$ .

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Step 2.3.1

Raising $0$ to any positive power yields $0$ .

$y = 0 - 4$

Step 2.3.2

Subtract $4$ from $0$ .

$y = - 4$

Step 3

y-intercept(s) in point form.

y-intercept(s): $(0, - 4)$

Step 4